Scientists observed that the populations of top-level consumers in a particular ecosystem were rapidly decreasing. Further studies revealed that there was also a decline in producer productivity. Which other changes did the scientists most likely observe in the ecosystem?
increased producer diversity
decreased population size at all levels
decreased primary consumer populations only
increased primary and secondary consumer diversity
Answer:
The correct answer is - decreased population size at all levels.
Explanation:
A decrease in the productivity of producers of an ecosystem will lead to a decrease in all other organisms of the ecosystem including top-level consumers to the bottom-level producers due to the fact that producers provide energy and food to primary consumers.
It is because they are the only organisms that convert the sunlight to usable energy and food that transfer from one trophic level to other, so if the population of producers or their productivity will decrease then there will be decreased population size at all levels.
Which are best to survive?
The fittest to the best adapted? Why?
Answer:
The best to adapted because they already know how to survive through the toughest situations instead of being fit which leads them to nowhere but death
have a good day :)
Explanation:
Research has found that chimpanzees in one area make spears to help them hunt bushbabies (African lorises). The chimpanzees locate a tree trunk in which the bushbabies live. They then select a tree branch, trim off the leaves and side branches, and trim the end of the branch to form a sharpened tip. The chimpanzees thrust these branches, like spears, into the tree to try to stab bushbabies (see the Lab 11 Exercise Image Library on p. 336 of your lab manual for associated images).
Is this behavior an example of nonhuman primate culture?
1. Yes
2. No
Primates often work together while hunting and then share the meat with others in the group.
1. True
2. False
Answer:
1. Yes
1. True
Explanation:
A.
Yes, it is a nonhuman primate cultural example: Despite the fact that many nonhuman primates lack apparent cultural traditions in the same manner that humans do, primatologists have uncovered a number of behavioral habits that differ between populations and are passed down through socialization and language interaction. The employment of tools by chimps for hunting is one of the most prominent examples of this. Chimpanzees in the African Savannah have been observed fashioning sticks into weapons to hunt bush infants, according to researchers. In each example, a chimp changes a branch by snapping off one or two ends and sharpening the stick with its teeth. The spear is then jabbed into the bottom of the trunk, where the bush infants slumber. Because this complicated behavior appears to differ between communities, it is thought that chimpanzee tool usage is socially acquired, and hence a cultural behavior.
B.
Chimpanzees hunt in groups so that they may corner their prey even if the canopy is continuous. Each chimpanzee within the hunting parties has a specific function to play during an arboreal hunt. Drivers are responsible for keeping the prey moving in a specific route and following them without trying to grab or catch them. Blockers are positioned at the base of the trees, climbing up to stop prey from fleeing in the other direction. Chasers move swiftly and attempt to capture the prey. Finally, when one monkey approaches, ambushers hide and flee. The food is delivered to all members of the hunting group once the animal has been trapped and slaughtered.
Identify how the physical barriers of the immune system protect the body against pathogens. Check all that apply.your nose produces oil to keep pathogens from entering the body through your noseskin contains tightly packed cellsskin is tough, flexible, and waterproofyou cough when a pathogen enters your mouthyou sneeze when a pathogen enters your nose
Answer:
Skin contains tightly packed cells.Skin is tough, flexible, and waterproof.You cough when a pathogen enters your mouth.You sneeze when a pathogen enters your nose.Explanation:
The physical barriers of the immune system prevent infections since they stop or expel any pathogen that enters the body. The skin with its cells tightly packed and characteristics, the endothelia, and mucous membrane, like the one in our nose, are physical barriers. They stop antigens from infecting our body since they can remove them by sneezing, coughing, or shedding.
Answer:
skin contains tightly packed cells
skin is tough, flexible, and waterproof
you cough when a pathogen enters your mouth
you sneeze when a pathogen enters your nose
Explanation:
Neanderthals differed from modern humans in: A. long (front-to-back), vertically low skull shape B. having smaller brain size than modern humans C. Having smaller incisor teeth than modern humans D. Creating less complicated stone tools than modern humans
Answer:
A. long (front-to-back), vertically low skull shape
Explanation:
The Neanderthals had a different body structure than doe the present modern humans have. The had a more robust well-built structure and had a distinctive morphological feature. Research suggests they were stronger than modern man thought they were slightly shorter than modern humans. They had a noticeable face, a chin, and a forehead slope.⚠️PLZ HELP⚠️
Figurative language helps a reader
Learn a foreign language
b. Visualize the poem
c. Make connections to the poem
d. None of the above
Please select the best answer from the choices provided
OA
ов
OD
Answer:
B. Visualize the poem
Explanation:
Figurative language such as Onomatopoeia gives help by visualizing the poem, because you can imagine the sounds and use it as an example to picture what would be going on in the story.
Answer:
b
Explanation:
What happens when particles in a liquid speed up? A. they speed up and become a gas B. they speed up and become a solid C. they lose energy and become plasma D. they stay the same
Answer:
A
Explanation:
Cardiogenic shock shock results when: The body loses an excessive amount of blood The body's blood vessels are dilated The left ventricle cannot pump enough blood to meet the body's demands Trauma results in temporary loss of the autonomic function of the spinal cord
Answer:
The left ventricle cannot pump enough blood to meet the body's demands
Explanation:
Cardiogenic shock is a problem that occurs when the heart cannot pump the adequate amount of blood to supply all organs. In this situation, the left ventricle, responsible for pumping oxygen-rich blood, cannot pump enough blood to tend the body's demands. This causes blood pressure to drop and oxygen in the tissues to be lacking. In addition, this situation can cause accumulation of fluid in the lungs. This is a very dangerous problem, being one of the main causes of myocardial infarction.
Compare and contrast the cell cycle with mitosis and the cell cycle with meiosis. Citing atleast 4 similarities and 5 differences.
Answer:
Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells. Below we highlight the keys differences and similarities between the two types of cell division.
Mitosis is a form of eukaryotic cell division that produces two daughter cells with the same genetic component as the parent cell. Chromosomes replicated during the S phase are divided in such a way as to ensure that each daughter cell receives a copy of every chromosome. In actively dividing animal cells, the whole process takes about one hour.
Meiosis is the form of eukaryotic cell division that produces haploid sex cells or gametes (which contain a single copy of each chromosome) from diploid cells (which contain two copies of each chromosome). The process takes the form of one DNA replication followed by two successive nuclear and cellular divisions (Meiosis I and Meiosis II). As in mitosis, meiosis is preceded by a process of DNA replication that converts each chromosome into two sister chromatids.
Using and spectrophotometer, you measure 2 dilutions of NADH, and get absorbance values of 0.4 for sample A, and 0.2 for sample B. You know that the path length is 1 cm, and the extinction coefficient for NADH is 6220 (L Morcm). Using the Lambert-Beer Law equation (below), calculate the concentrations of sample A Select] and Sample B (Select ] A = log10 () = Ecl Where: A- Absorbance C- Concentration (mol 1 - Path length (cm) E = molar decadic extinction coefficient L mol. cm 1o - Intensity of the incident light 1 - Intensity of the transmitted Night
Answer:
The answer is "The concentration sample A= 0.00006[tex]\frac{mol}{L}[/tex] and concentration of sample B is 0.00003[tex]\frac{mol}{L}[/tex]".
Explanation:
Length of path [tex](l)=1 \ cm\\\\[/tex]
Coefficient extinction[tex](\varepsilon )=6220\ \frac{L}{Mol \ cm}\\\\[/tex]
Absorbace of sample [tex](A)=0.4\\\\[/tex]
Absorbace of sample [tex](B)=0.2\\\\[/tex]
For sample A:
[tex]A=\varepsilon cl\\\\0.4=6220 \times c \times 1\\\\c=\frac{0.4}{6220}\\\\[/tex]
[tex]=0.00064\ \frac{mol}{L}[/tex]
For sample B:
[tex]A=\varepsilon cl\\\\0.2=6220 \times c \times 1\\\\c=\frac{0.2}{6220}\\\\[/tex]
[tex]=0.00003\ \frac{mol}{L}[/tex]
Pls help I’ll brainlest
You can pick more than one I think
Answer:
I say the correct answers are C and D and E maybe.
Explanation:
But I say both good and right answer are C and D. And just E for backup!
Is this right ????????????????????
I do believe they made a mistake ???
Answer: yes it is correct
Explanation:
Hope this helps you with your science work :)
Only a very few flowering plants have been able to invade the oceans. But the few marine ones are very successful. What are some reasons for the small number of marine flowering plants
Answer:
1. High osmotic pressure due to the hypersaline nature of marine habitats
2. The dependence of flowering plants on pollinating insects for fertilization. These insect pollinators are however, absent in the marine environment.
3. Competition from already-established sea weeds and grasses provides another challenge to flowering plants invadingnthe oceans.
4. Constant changes in the environment as well as temperature changes too
Explanation:
The marine environment is a hypersaline environment with a high salt concentration relative to that of the plant cell. Due to high salt concentration of the marine environment, their is high osmotic pressure on living oragnisms found therein. Organisms must have well-adapted osmo-regulatory mechanisms to counteract the high osmotic pressure of their environment. Therefore, flowering plants face the challenge of removing excess salt from their cells or else lose water to their environment, hence resulting in the death of the plant. However, most flowering plants lack this ability and thus, have found it difficult to invade the oceans.
Flowering plants depends on insect-pollinators for fertilization. However, these insect are not found in the oceans, and as such, it is difficult for flowering plants to invade the oceans.
Well-adapted seaweeds and grasses serve as competitors for any invading flowering plant. Since the flowering plants are not yet adapted for life in marine habitats, they lose out in this competition.
The oceans are constantly in a state of frequent turbulence and change due to tides and currents. Also, the temperature of the oceans are very low and fluctuations in the temperatures of the ocean do occur, utimately serving as obstacles to invading flowering plants to adapt to life in the oceans and seas.
1.What do other organisms rely on plants for?
Answer: Organisms depend on other organisms and on the nonliving things in an ecosystem to meet their basic needs for food, water and protection. 3. Plants use energy from the sun to produce their own food from air and water.
Explanation:
Which of the following cells do not have specialized tasks in an organism? 1.) prokaryotic cells 2.) eukaryotic cells 3.) animal cells 4.) plant cells
Answer:
A. Prokaryotic cells
Explanation:
Prokaryotic cells don't have organelles
Which of the following is NOT associated with Okazaki fragments?
A.
lagging strand
B.
ligase
C.
bases added to the 3’ end
D.
continuous replication
E.
DNA polymerase III
Answer:
The correct answer is - D. continuous replication.
Explanation:
Okazaki fragments are short DNA sequences synthesized in the lagging strand as DNA polymerase enzyme is able to synthesize only from 5' to 3' so nucleotide can not bind on 5' end but only 3' end and the DNA strands are antiparallel.
They are short fragments of DNA synthesized from RNA primers on the lagging strand and combined by the ligase enzyme. Okazaki fragments show a discontinuous manner in the synthesis of DNA.
The correct answer is D. continuous replication as they don't have it.
Okazaki fragments are brief DNA sequences synthesized withinside the lagging strand as DNA polymerase enzyme is capable of synthesizing simplest from 5' to 3^ high SO nucleotide can't bind on 5' cease however simplest 3' cease and the DNA strands are antiparallel.
They are brief fragments of DNA synthesized from RNA primers at the lagging strand and blended via way of means of the ligase enzyme. Okazaki fragments display a discontinuous way withinside the synthesis of DNA.
What are Okazaki fragments?Okazaki fragments are small sections of DNA that might be fashioned all through the discontinuous synthesis of the lagging strand all through DNA replication. They are essential due to the fact they permit each daughter strand to be synthesized, which is vital for molecular division.
Thus it is clear thsat Okazaki fragments are not associated with continuous replication.
To know more about Okazaki fragments refer to the link :
https://brainly.com/question/21265857
Compare and contrast the cell cycle with mitosis and the cell cycle with meiosis. Citing 4 similarities and 5 differences.
Answer:
according to the type
Explanation:
they depend on the type
a natural source of carbon dioxide in our atmosphere
Answer:
Animals, Humans, Oil, Gases, And Coal all contain Carbon Dioxide in our atomosphere.
Explanation:
An opportunistic predator switches prey, capturing whichever prey species is most abundant. As soon as the prey numbers dwindle and another species becomes more abundant, the predator will consume the more abundant species. In doing so, this predator maintains great biodiversity in the community. This type of predator is called a
Answer:
The correct answer is keystone predator.
Explanation:
In sustaining the composition of an ecological community, a keystone species plays an essential function. In the absence of keystone species, the ecosystem would fail to exist and would become drastically different. A predator is a classic illustration of a predator, which inhibits a specific herbivorous species from eradicating the dominant species of plants. In the non-existence of predators, the herbivorous prey would increase enormously and would clean the entire essential plant species, and thus, drastically change the significance of the ecosystem.
Scientists have discovered a new marine bacterial species called Vibrio nuigii. They have isolated ten strains of this bacterium and determined their whole genome sequences. Only one of the strains (which the scientists named Vir1) is virulent and causes disease in oysters. Describe three ways in which the scientists could use their knowledge of the bacterial genome sequences to identify the genes responsible for virulence.
Answer:
1-by transfecting small interfering RNAs against target genes of interest
2-by using comparative genomics strategies in order to infer functional relationships among target genes of interest and homologous genes responsible for virulence in other bacteria (e.g., antibiotic resistance genes)
3- by inducing mutations through site-directed mutagenesis in order to study gene function (i.e., by examining the effects of knockout mutations)
Explanation:
Whole-genome sequencing (WGS), also known as complete genome sequencing, refers to Next Generation Sequencing technologies that allow the obtention of the entire genetic sequence of an organism/cell, which can be used as a reference genome to understand gene function, evolutionary relationships, etc. The information provided by WGS technologies allows making many different types of genetic analyses in order to understand gene function. First, the nucleotide reference sequence can be used to design complementary small interfering RNAs that trigger degradation of target messenger RNAs (mRNAs) by the RNA interference (RNAi) pathway, thereby inhibiting gene function (in this case, inhibiting genes associated with virulence in the bacterial strain). Second, a reference genome is required to perform bioinformatic data analyses in order to identify homologous genes associated with virulence in evolutionarily related bacteria, allowing identify, for example, antibiotic resistance genes or sequence polymorphisms (e.g., single nucleotide polymorphisms, SNPs) associated with gene function. Third, the information provided by a reference genome can also be used to trigger site-directed mutagenesis (for example, by using the highly precise CRISPR-Cas9 genome editing technology) in order to knock out specific genes of interest and thus analyze if the bacterial strain is still infectious.
The coloration of fishes is due to special cells called
Group of answer choices
chlorophyllcytes
pigmentacytes
chromatophores
coloration cells
Answer: chromatophores
Explanation:
The coloration of fishes is due to special cells called chromatophores. Chromatophores are referred to as the cells which produces color. They are seen in animals such as reptiles, fish,amphibians, and crustaceans.
On the other hand, mammals and birds, have a class of cells that is refered to as melanocytes for coloration. The main function of chromatophores is simply for camouflage.
1)
What is the approximate percentage of Earth's history during which humans have existed,
compared to the age of Earth?
A)
0.04%
B)
1.79%
C)
4.65%
D)
8.32%
Answer:D) 8,32%
Explanation:
Answer: 0.04%
Explanation:
pls help
Identify the organelle that packages and secretes proteins and membrane parts
A. Nucleus
B. Mitochondria
C.Golgi Apparatus
D.Cell Membrane
What domain is eubacteria found in?
[tex]{\boxed{\mathcal{\red{AnSwEr:}}}}[/tex]
[tex]\sf\purple{Domain \:Bacteria.}[/tex]✔
The Eubacteria are found in the domain Bacteria.Eubacteria means [tex]\sf\pink{true\:bacteria}[/tex], it is unicellular, lacks a proper nucleus and is a prokaryote.[tex]\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘[/tex]
main component of protein
Answer: April Cashin-Garbutt, MA, reviewed it (Cantab) Collagen is a protein composed up of amino acids, which are carbon, oxygen, and hydrogen molecules. Glycine, Proline, Hydroxyproline, and Arginine are among the amino acids found in collagen. Collagen makes up around a third of the proteins in the human body.
Explanation:
knowledge!
A white-tailed deer cannot make its own food and must consume other organisms
for its nutrition. Therefore, the white-tailed is considered a (an)
A)heterotroph.
B)producer.
C)chemotroph.
D)autotroph. .
Answer:
A) Heterotroph
Explanation:
White tailed deers are consumers and do not produce their own food. Most mammals can’t either. Putting in the heterotroph category.
Hope this helps, good luck!
In which phases of mitosis and meiosis are the principles of segregation and independent assortment at work?
Answer:
1-Meiosis:
- Independent assortment: Anaphase I
- Segregation: Anaphase II
2-Mitosis
- Segregation: Anaphase
Explanation:
The Principle of Independent Assortment described by Mendel indicates the mechanism by which different genes get sorted into gametes (i.e., eggs and sperms in mammals) independently of one another, while the Principle of Segregation indicates the mechanism by which gene variants (i.e., alleles) segregate (separate) into gamete cells. In eukaryotic organisms, independent assortment occurs during anaphase I of meiosis, when each pair of homologous chromosomes separate. The assortment of homologous chromosomes during anaphase I explain how genes on different chromosome pairs will segregate independently of one another. On the other hand, the separation (segregation) of sister chromatids occurs in Anaphase II, where gametes carrying single gene variants (i.e., alleles) for each locus are generated.
Which statement is true regarding the way in which sex chromosomes are passed on to offspring? Females can pass only Y chromosomes to their offspring. Females can pass either an X or a Y chromosome to their offspring. Males can pass either an X or a Y chromosome to their offspring. Males can pass only Y chromosomes to their offspring.
Answer:
Males can pass either X or Y to their offspring's
Explanation:
Males determine the age (not on purpose) females have the kid
Males can pass either an X or a Y chromosome to their offspring, while females can pass only an X chromosome to their offspring. Therefore, the statement that is true regarding the way in which sex chromosomes are passed on to offspring is: "Males can pass either an X or a Y chromosome to their offspring."
What is the function of sex chromosomes ?Sex chromosomes determine the sex of an individual and are responsible for the inheritance of sex-linked traits. In humans, there are two sex chromosomes: X and Y. Females have two X chromosomes, while males have one X and one Y chromosome.
During sexual reproduction, the sex chromosomes are passed on to offspring from their parents. The father can pass on either an X or a Y chromosome to his offspring, while the mother can only pass on an X chromosome. This means that the sex of the offspring is determined by the father's contribution of either an X or Y chromosome.
If the father contributes an X chromosome, the offspring will be female (XX). If the father contributes a Y chromosome, the offspring will be male (XY). This means that while the mother's contribution is always an X chromosome, the father's contribution determines whether the offspring will be male or female.
Sex-linked traits, such as color blindness and hemophilia, are carried on the X chromosome. Because females have two X chromosomes, they can be carriers of these traits without exhibiting symptoms themselves. However, males only have one X chromosome, so they are more likely to exhibit symptoms of sex-linked traits if they inherit a faulty gene on that chromosome.
Overall, the inheritance of sex chromosomes plays an important role in determining the sex of an individual and can influence the inheritance of sex-linked traits.
Learn more about inheritance at :
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Please answer only if you know this is a final 
Answer:
Explanation:
The symbiotic relationship between a flower and the insect that feeds on its nectar is an example of a. mutualism because the flower provides the insect with food and the insect pollinates the flower.
Pregnancy comes with a unique set of diet and lifestyle guidelines. Some substances are particularly beneficial for the mother or baby, others are harmful, and some should be used with caution.
a. True
b. False
Answer:
I believe it it A. True
Hope this helps
Answer:
a
Explanation:
the concentration of substances contained in e.g some medicines might be okay for a woman who is not expecting but the the impact is totally different to someone who has a baby growing in their uterus,this is so because babies are very delicate and reactive to strong chemicals