Answer:
Biomes
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Which of the following scenarios represents change to an ecosystem brought about by biotic factors?
a.
a wildfire caused by lightning striking a tree
b.
a flood caused by a severe storm
c.
a landslide caused by cattle overgrazing
d.
a volcano
Please select the best answer from the choices provided
A
B
C
D
Answer:
C
Explanation:
what is the wavelength of a wave with the speed of 680 m/s and the frequency of 400 hertz
Answer:
Wavelength of the wave is [tex]1.7[/tex] meter
Explanation:
As we know that
[tex]c = \lambda *v[/tex]
C is the speed of light
[tex]\lambda[/tex] is the wavelength of light
v is the frequency of the light
Substituting the given values in above equation, we get -
[tex]680 = \lambda * 400[/tex]
[tex]\lambda = \frac{680}{400}\\ \lambda = 1.7[/tex] m
5. Which of the following statements is true of nearsighted people?
Their retinas that are slightly misshapen
They have trouble seeing nearby objects
Their vision problems can be corrected with convex lenses
The lenses of their eyes focus light in front of their retinas
Answer:
B.
Explanation:
The researchers set up experimental and control microcosms, or small artificial ecosystems, to measure the release of minerals from rocks. First, they placed rock fragments of volcanic origin, either granite or andesite, into small glass containers. Then they made a suspension of water and macerated (chopped and crushed) moss of the species Physcomitrella patens. They added this mixture of water and moss to the experimental microcosms. For the control microcosms, they filtered out the moss and just added the water. After 130 days, they measured the amounts of various minerals found in the water in the control microcosms and in the water and moss in the experimental microcosms. How did the setup of the control and experimental microcosms differ
Answer:
The correct answer is - Control microcosms did not contain living moss, while experimental microcosms did contain living moss.
Explanation:
The difference between the control microcosms and experiment Microcosms is, the presence of the living moss in the experimental group whereas the control group does not contain living moss.
The independent variable in this research setting is the presence or absence of the living moss and for the control group, the mosses are filtered out and only added the water.
Which statement is incorrect about the Geologic Time Scale? A Life was not present when the Earth was still cooling. B Prokaryotes showed up on Earth long before any long reptiles and Small plants. C Modern humans arrived later than reptiles and small plants D Dinosaurs showed up just after the Earth was created.
Prokaryotes showed up on Earth long before any long reptiles and Small plants statement is incorrect about the Geologic Time Scale
what are the characteristic features of prokaryotic cell ?Prokaryotic cells are microorganisms include Bacteria and Archaea while other photosynthetic prokaryotes are cyanobacteria which do photosynthesis.
A prokaryotic cell is a single membrane bound cell where all the metabolic reactions occur within the cytoplasm, free-living or parasites in nature, they lack nuclear membrane.
In prokaryotes the organelles like Mitochondria, Golgi bodies, chloroplast, and lysosomes are absent, whereas genetic material is present as a single chromosome;
The prokaryotic cell divide by binary fission where as the sexual mode of reproduction involves conjugation.
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what benefits are there for organisms that reproduce using mitosis instead of sexual reproduction?
Answer:
A single cell dividing by mitosis is an example of asexual reproduction--you now have two identical daughter cells (usually thought of as diploid 2n) from one single mother cell.
Meiosis is important to sexual reproduction, because through events like crossing over during prophase 1 (the swapping of genetic material between sister chromatids after a process of pairing called synapsis, the exchange sites are called chiasmus) and independent assortment during metaphase, meiosis creates the variation in genetic material that is potentially advantageous to sexually reproducing organisms and can potentially be acted upon by natural selection to drive the process of evolution.
Meiosis creates haploid gametes (n) that when joined together in fertilization create a genetic combination never having previously existed
Explanation:
What are some warming behaviors an animal might perform to warm its body temperature up?
BRAINLIEST!! 5 STARS AND A THANKS!!
Who finally provided enough evidence for the theory of plate tectonics to be widely accepted, and where was this evidence found?
Answer:
Alfred wegener was the one that provided the evidence for plate tectonics
Answer:
Alfred Wegener
Explanation:
German meteorologist Alfred Wegener is often credited as the first to develop a theory of plate tectonics, in the form of continental drift.
Describe the borders of Israel after the 1948 War?
Answer:
Israel borders Egypt, Jordan, Lebanon, Syria, and the Palestinian territories of West Bank and the Gaza Strip; it shares maritime borders with Cyprus.
Explanation:
yayy boom
A student claims that the lac operon is an example of a mechanism that an organism uses to conserve energy. Evaluate the validity of the student's claim. The claim is invalid because the lac operon requires a bacterial cell to produce extra regulatory proteins and regulatory segments of DNA. The claim is valid because the lac operon allows a bacterial cell to shut down a metabolic pathway if it is not immediately needed. The claim is valid because the lac operon allows a bacterial cell to maintain constant levels of enzymes even when they are not immediately needed. The claim is invalid because the lac operon requires a bacterial cell to constantly produce the lac repressor protein even when lactose is not present.
Answer:
The claim is valid because the lac operon allows a bacterial cell to shut down a metabolic pathway if it is not immediately needed.
Explanation:
The lac operon is a cluster of genes which contain the same promoter sequence and are transcribed as a single messenger RNA (mRNA). This operon is inducible because the presence of lactose in the cell influences its transcription. Lactose can bind to the repressor of this operon, leading to a conformation change in the repressor, thereby preventing the repressor from binding to the operator and thus allowing transcription of the structural genes. After lactose addition, the β- galactosidase enzyme can break this carbohydrate into glucose and galactose, thereby there is no lactose able to bind with the repressor and therefore this operon shuts down. During transcription, the promoter of the lac operon binds both RNA polymerase and catabolite activator protein (CAP) and cyclic AMP (cAMP) complex.
in prophase 1 of meiosis, crossing over results in
Answer:
Crossing over results in Genetic Recombination.
Explanation:
If 5% of a DNA sample contains adenine, what percentage is Thymine? How about Guanine? Cytosine?
Answer:
Lol! I had this for homework for biology class too. Thymine should be 5%, and Guanine and Cytosine should both be 45% I think.
Explanation:
Since A is 5% and T pairs with A, T should also be 5%. These two combined is 10%.
100-10 = 90
We still have two left, Guanine and Cytosine, so 90/2 = 45
That should mean G and C are both 45%.
Evidence exists that during the millions of years in which the Grand Canyon formed, the canyon divided a single population of tufted-eared squirrels into two populations. One of these squirrel populations, the Kaibab squirrel, now lives in isolation from the other tufted-ear squirrels on the North Rim of the canyon. The other population, the Abert's squirrel lives on the South Rim. Some biologists think that the two populations of squirrels have evolved into two separate species. Other biologists think that the Kaibab squirrel is a subspecies of the Abert's squirrel.
Answer:
A few of the squirrels manage to cross the canyon and breed with the squirrels on the other side.
Explanation:
The formation of the canyon divide the population of the tufted ear squirrels into two different population or species of the squirrels. One is the Kaibab squirrel which lives in the north Rim of the canyon while the other is the Albert's squirrel that lived in the South Rim.
The Kaibab squirrel has a black belly, white tails and tufted ears while the features of the Albert's squirrel is that it has white belly, white tail and tufted ears.
Now the factors that could make the evolution or the formation of the squirrel population in two different species less likely is the few of the squirrels might have crossed the Grand Canyon and moved to the other part and breeded with the squirrels there. So both the species have somewhat similar features.
Why don’t rivers run straight?
Answer:
Rivers don't run straight because water flows in the least path of resistance
Explanation:
It is small disturbances in topography that set off reactions that alter the path of a river Any kind of weakening of the sediment on one side of a river due to animal activity it could also be because of soil erosion, or human activity can draw the motion of the water towards that side.
Biology I (20 points)
Help :/
An error in gamete formation results in a zygote with an XXY chromosome combination. Which characteristic of an individual is affected by this combination?
Answer:
The XY chromosomes refer to the gender chromosomes and a mutation to where a child is born with XXY chromosomes would mean that the child Would have Klinefelter syndrome. A child with XX chromosomes is a female and a child with XY chromosomes is a male. The mutation has an extra gamete.
I hope this helps! :)
The correct answer for the given question about Klinefelter syndrome is Sex characteristics Traits.
What is Klinefelter syndrome?The XY chromosomes are the gender chromosomes, and Klinefelter syndrome would result from a mutation that caused a kid to be born with XXY chromosomes. When a male kid is born with extra X chromosomes, this condition develops.One X and one Y chromosome make up the majority of male, and an additional chromosome might give a male various different physical characteristics.When the genetic material breaks unevenly in the egg, an additional X chromosome is created. It may also manifest if the sperm's genetic material divides unevenly.Thus we can conclude that such condition will be called as Klinefelter syndrome as Sex characteristics Traits gets affected.
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A(n) what is a chemical produced by one animal to influence the
behavior of another animal of the same species?
Explanation:
The answer is ( faramones). for mating purposes..
HELPPP!!!! Which element is also an air
pollutant?
A. copper
B. lead
C. silver
D. zinc
Answer:
lead
Explanation:
Lead element is also an air pollutant. Thus option B is correct.
What are the air pollutants?
Any physical, chemical, or biological changes in air due to contamination by incorporation of harmful gases, dust, and smoke causes air pollution.
The imbalance in the gaseous concentration in air lead to global warming.
There are two major types of air pollutants such as Primary and Secondary Pollutants,
Primary pollutants cause air pollution directly and secondary pollutants are generated by intermingling of primary pollutants.
Lead, Fly Ash, Metallic Oxides, Nanoparticles, Carbon monoxide (CO), Carbon dioxide (CO2), Chlorofluorocarbons (CFCs), Ozone (O3), Nitrogen oxide (NOx), Sulphur dioxide (SO2) are some examples of air pollutants.
A hazardous heavy metal called Lead can cause serious damage to different physiological system of the human body like nervous system damage, Digestive system, affect kidney.
It can also cause cumulative food poisoning. Hence, Lead was banned to add fuels. Thus option B is correct.
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Which of the following is NOT a primary mineral?
A. Mica
B. Feldspar
C. Quartz
D. Limestone
Answer:
D
Explanation:
limestone isn't a primary mineral
when an organism reproduces through asexual reproduction, how many parent organisms contribute DNA to the offspring?
Answer:
Asexual reproduction produces offspring from just one parent. These offspring are genetically identical to that one parent.
Explanation:
When a crocodile has birds in its mouth, what symbolic relationship does it represent?
Answer:
The symbiotic relationship between the crocodile and the plover bird is exemplary of two organisms working together. The plover bird flies inside the crocodile's mouth, which may seem dangerous for the bird and food for the crocodile
Explanation:
What is cyclone?
Hey any body here
#Pari here.
Answer:
yes I m there
Explanation:
what happened
1. There are
domains.
1
2
3
4
Answer:
3
Explanation:
There are three domains of life, the Archaea, the Bacteria, and the Eucarya.
Answer:
There are 3 domains
Explanation:
the Archaea, the Eucarya, the Bacteria.
write downany two organisms which shows binary fission
Answer:
Amoeba and Paramecium
Answer:
Amoeba,
Euglena
Explanation:
In biology, binary fission is a type of asexual reproduction where a parent cell divides, resulting in two identical cells, each having the potential to grow to the size of the original cell. ... Binary fission is common among prokaryotes, e.g. archaea, eubacteria, cyanobacteria, and certain protozoans (e.g. amoeba)
I need help quick please and thank you
Answer:
Honey, we need to read the passage in order to help you answer the questions :)
Explanation:
Which food preservation technique is Paul using?
Paul uses____ technique, which is the most modern technique of food processing and preservation. This technique uses____ rays to kills Insects, mlcrobes, bacteria, and fungi In food.
1. Freeze drying
2. Irradiation
3. Dehydration
__________
1. Alpha
2. Beta
3. Gamma
Answer:
Paul uses Irradiation. The technique uses gamma rays
Explanation:
Answer:
Agreed.
irradiation
gamma
Explanation:
yall please help me!!!
Which period of time had MORE carbon: pre-industrial or post-industrial revolution?
Use your own words to summarize the steps of the specific immune response. Identify each step and the function of the immune cell involved in that step
Answer: The steps of a specific immune response includes: antigen recognition --> antigen presentation--> clonal expansion--> attack.
Explanation:
In the resistance of the body to infection, the human body has the ability to develop extremely powerful specific immunity against individual invading agents such as lethal bacteria, viruses, toxins and even foreign tissues from other animals. A typical example of a specific immunity is the ADAPTIVE or ACQUIRED IMMUNITY. This is defined as the immunity caused by a special immune system that forms antibodies and/ or activate lymphocytes that attack ans destroy the specific invading organisms or toxins.
There are two types of adaptive immunity which include the cell mediated immunity and the antibody mediated immunity.
The steps and the cells involved in these specific immune response includes:
--> ANTIGEN RECOGNITION: these invading organisms or agents contains one or more specific chemical compounds in its makeup that are different from all other compounds. These substances are called ANTIGENS. The T -lymphocytes and the B- lymphocytes are able to recognise and be sensitized by these antigen particles.
--> ANTIGEN PRESENTATION: These antigens need to be presented to the T- lymphocytes unlike the B- lymphocytes that bind antigen particles without having to be presented by any antigen presenting cell. Example of antigen presenting cell is the MACROPHAGES. they present the antigen to T-lymphocytes by engulfing and digesting the antigen which they transport the most antigenic fragment to their own cell membrane where it is displayed on their surface.
--> CLONAL EXPANSION: After presentation of the antigen to the T- lymphocytes, it stimulates the division and proliferation of the T- lymphocytes to produce specialised T- lymphocytes which will attack the original antigen in different ways.
--> ATTACK: After clonal expansion of T-lymphocytes the specialised T- lymphocyte cells produce initiates different attacks. These cells include:
• Memory T- cells: these long-lived cells survive after the threat has been neutralised and provide specific immunity by responding rapidly to another encounter with the same antigen.
• Cytotoxic T- cell: they directly inactivate any invading target cell and release powerful toxins.
• Helper T-cells: These cells produce special chemicals called cytokines which support and promote Cytotoxic T-lymphocytes and macrophages.
•suppressor T-cells: These cells act as 'brakes', turning off activated T- lymphocytes thereby limiting the powerful and potentially damaging effects of the immune response.
Species like fish and turtles have many predators. These species produce more offspring than will survive. Which of the following correctly addresses an advantage and disadvantage of the overproduction of offspring?
Species have an increased chance of survival and parents are able to care for the young.
Competition of resources in the environment is reduced and species have a decreased chance of survival.
Overproduction of one species can threaten another species and species can become resistant to medicine.
Populations of species have increased genetic variation and competition for resources in the environment is increased.
Answer:
D?? I hope this helps.
Explanation:
Explain why tongue rolling ability is a discontinuous variation
Since tongue rolling ability is determined by a single gene with two separate alleles—the dominant allele, which codes for tongue rolling ability, and the recessive allele, which codes for tongue rolling incapacity—tongue rolling ability is a discontinuous variation.
What is Tongue rolling ability?The hereditary characteristic known as tongue rolling ability controls whether or not a person can roll their tongue into a tube shape. This characteristic is frequently used as an illustration of a straightforward hereditary trait with discontinuous variation since there are only two possible outcomes: either a person rolls their tongue or they do not.
Either a person has the recessive allele, which prevents them from rolling their tongue, or they have the dominant allele, which allows them to roll their tongue. There is no intermediate or in-between trait, and the presence or absence of the dominant allele is a distinct, plainly observable phenotype.
Therefore, the capacity for tongue rolling is an illustration of a discontinuous variation.
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