Answer:
4.6 billion years ago
Explanation:
Answer:
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.
Explanation:
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The period directly following the action potential is known as?
The Earth is the only planet known to support life. Which of the following is a major contributing factor to the Earth's ability to support
life?
A) The Earth has a magnetic field with north and south poles
B) The earth has an iron-rich core and is made mostly of rock
C) The Earth orbits the Sun and is orbited by the moon
D) The Earth is surrounded by a layer of air that includes oxygen
Answer:) The Earth has a magnetic field with north and south poles
Explanation:
How does wind affect the water cycle?
Answer:
Explanation:
Earth's water evaporates, winds move water vapor from the sea to the land, increasing the amount of fresh water on land. Wind and evaporation patterns from the first animation are shown here on a map of the world. ... The ocean loses water to the air when the water
hi
Below are two sequences of a segment of DNA.
Normal sequence TGA CAC TAG
Mutated sequence TGA CCT AG
Which type of mutation has occurred?
Choose 1 answer:
Deletion mutation
Nonsense mutation
Insertion mutation
Substitution mutation
Answer:
Deletion mutation
Explanation:
The mutated sequence shows the deletion of adenine (A) from the second codon.
Answer: insertion mutation
Explanation:
Help ASAP please!!!!!!!
Answer:
je n'arrive pas à faire ton travail, je suis desolé
In a histology section of the digestive tract, you observe that the mucosa is made of simple columnar epithelium and the tissue has three layers of smooth muscles. This section represents ________. In a histology section of the digestive tract, you observe that the mucosa is made of simple columnar epithelium and the tissue has three layers of smooth muscles. This section represents ________. duodenum large intestine stomach esophagus
Answer:
The correct answer is - stomach.
Explanation:
The stomach is the only part of the digestive tract among the duodenum, large intestine, stomach, and esophagus that has three layers of smooth muscle.
The duodenum, large intestine, and esophagus simple columnar epithelium, and others have two -layers of smooth muscles and have simple columnar epithelium. This suggests that the mucosa is the section of the stomach in the digestive tract
Describe the term epitoky
Answer:
Explanation: polychaeta marine worms wherein a sexually immature worm in which the species the atoke, is tranformed into a sexually mature worm the epitoke
Why does carbon monoxide a triple bond instead of a double
Answer: If there was a double bond between the carbon and the oxygen, either the oxygen or carbon would only have access to six electrons, thus violating the octet rule. I think this is right but I'm not 100% sure
A(n)
reaction removes a functional group to a substrate.
Answer:
a
Explanation:
a
What is a habitat?
O A. A group of organisms that produce fertile offspring
B. The place where a particular plant or animal lives
O C. A group of organisms that interact within an ecosystem
O D. All of the resources a species uses within its ecosystem
Answer:
A habitat is
B. The place where a particular plant or animal lives
Done!
Hope it helps once again and also in a better way!!!
The prolonged increase in heart and breathing rates during the snow skiing trip was probably a result of:______
a. activation of the sympathetic autonomic nervous system by the new experience.
b. activation of the parasympathetic autonomic nervous system by the new experience.
c. hypoxia caused by insufficient blood hemoglobin concentration to supply oxygen for exercise at the low oxygen pressure found at high altitudes.
d. depressed core body temperature (hypothermia) caused by exposure to cold temperatures at high altitudes.
Answer:
The correct answer is - option C.
Explanation:
Skiing generally happens on higher altitudes such as mountains. It is known that there is less oxygen is available at higher altitudes. There is low oxygen pressure at such height.
The prolonged increase in heart and breathing rate is due to less oxygen available for the cells. This condition is known as hypoxia caused by insufficient blood hemoglobin to supply oxygen for physical activities at higher altitudes.
What ecological factors do you think might come into play when deciding how to time a pulse flow?
Answer:
- Species inhabiting the river and surrounding areas
- Hydraulic characteristics
- Geomorphology dynamic
- Water quality
Explanation:
Presence of different species: Assay the species inhabiting the area of the river corridor. These species include invertebrates, animals such as fishes, amphibians, reptiles, birds, and mammals, and plants living near the shore and on the floodplain. These species might be affected in some portion of their life cycles by the difference in the river pulse flows. Life stages and population dynamics might be considered of importance when timing the pulse flow.
Hydraulic characteristics: Habitat in aquatic systems varies according to the season and the pulse flow. Depth, velocity, substrate, and instream cover might be considered important factors influencing the presence of different species and their development.
Geomorphology: Refers to the shape of the channel and floodplain. These will depend on the stream velocity, sedimentation, depth, among others. The river geomorphology is in constant change, from season to season. This dynamic also affects the shape of the floodplain and riparian zone.
Water quality: Refers to the difference in sediments, suspended elements, available nutrients, dissolved oxygen, and temperature. All of these affect and influence different forms of life and their evolution through the corresponding cycle stages.
Which statement describes an interaction between the biosphere and the atmosphere that is related to
photosynthesis?
O During photosynthesis, plant roots take in water from soil.
O During photosynthesis, plants take in carbon dioxide from the
air.
O Through photosynthesis, energy stored in plants is released into the air.
• Through photosynthesis, energy stored in plants is transferred to
humans who eat them.
Answer:
the second problem of course because, Plants need carbon dioxide and water from air and soil.
Explanation:
O
Answer: The answer is: During photosynthesis, plants take in carbon dioxide from the
air.
Explanation: I have my ways ;>
Another aspect of the competitive exclusion principle is that animals that compete within the same environment may eventually come to occupy their own NICHE. A niche is a way of life, and includes how the animal lives, what it eats, reproduction strategies and more. For example, a hawk and owl both eat the same kinds of food, but the owl hunts at night and the hawk during the day. How did your final ecosystem?
Answer:
Both hawk and owl share the same habitat or ecosystem.
Explanation:
According to competitive exclusion principle, two species can't coexist in the same environment if they occupy exactly the same niche but in the case of hawk and owl, it is possible because both have different times of eating habits. Hawks hunts at daytime while on the other hand, an owl hunts at night so both share the same habitat due to difference in their niche and they are present in the same ecosystem.
_____ feedback is when the body reacts in the same direction as a stimulus.
Negative
Positive
Answer:
It's Positive.
Negative is when it reacts against the direction as a stimulus
To assist in completing this question, you may reference the Animated Technique Video - Gel-Filtration Chromatography. Consider a mixture of four proteins with various molecular weights. A histone molecule weighs 15 kDa, a p53 molecule weighs 53 kDa, an actin molecule weighs 42 kDa, and an IgG molecule weighs 150 kDa. Arrange the molecules in order of their elution from a gel filtration column
Answer:
IgG molecule, p53 molecule, actin molecule, histone molecule
Explanation:
In a Gel-Filtration chromatography, the larger molecules elude faster from the gel than the small ones.
In a Gel-Filtration chromatography, there is a stationary phase and a mobile phase. The stationary phase has beads with pores. Small molecules enter the beads and descend through these beads' pores. On the other hand, large molecules do not enter the beads' pores, so they go down through the mobile phase faster than the small molecules. Since they do not have the obstacle of the pores, they descend between the beads more fluidly. As a result, the larger molecules elute first from the gel than the small molecules.
What are some Non-examples of a Fossil record?
Answer:
Explanation:
A fossil record is a group of fossils which has been analyzed and arranged chronologically and in taxonomic order. Fossils are created when organisms die, are incased in dirt and rock, and are slowly replaced by minerals over time. What is left is a mineral impression of an animal which once existed. Many fields and specialties are utilized to categorize and arrange these fossils, including comparative anatomy, radiometric dating, and DNA analysis. Using the data from the fossil record, scientist try to recreate phylogenies, or trees describing the relationships between animals, both alive and extinct. The fossil record helps inform how different groups of animals are related through evolution.
Answer:
Fossils are the geologically altered remains of a once-living organism and/or its behaviour. There are two main types: body fossils represent all or part of the organism’s body, and trace fossils show evidence of the organism’s behaviour. The study of fossils is called paleontology, from the Greek meaning ‘ancient (paleo-) being (onto-) study (-logy)’. Scientists who study fossils are called paleontologists. Fossils are of particular interest to geologists as they can help determine the age of a particular rock compared to other rocks, or identify the environment in which the rock was formed.
Which of the following are characteristics of Ascomycota? Check all that appply. PLEASE HELP!!
Answer:
2.spores produced in the ascus
4.important in the food industry
6.can cause disease in plants
Explanation:
Answer:
spores produced in the ascus
important in the food industry
important in the digestion of animals (leafcutter ants for one)
can cause disease in plants (dutch elm disease)
can cause disease in animals (candidiasis for one)
Explanation:
4.
Which of the following major biomes is most similar to that of the tundra biome?
desert
grassland
temperate forest
chaparral
Answer:
desert
Explanation:
they both have plants and animals that need special adaptations to survive there
Homer Simpson loves to garden and wants to grow lots of pink flowers for his pal Moe. He bought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day. The one without sun dies while the one with sun grows. 6. What is Homer's Independent Variable in the experiment? 7. What is the Dependent Variable in his experiment? 8. What is one constant you can identify in this experiment? 9. What is one error that could have occurred in this experiment? 10. What is one thing Homer could do to improve this experiment to test if the Flower Power fertilizer really worked? 11. What conclusion can Homer make about the Flower Power fertilizer?
Answer:
Oh HoMeY.............
What can the result be if DNA replication does not occur without errors?
A. No genetic diversity
B. It has not been researched enough yet to know
C. A perfect, mutation-free society
Answer:
C. A perfect, mutation-free society
Explanation:
Mutation is a genetic phenomenon involving the alteration or change in the genetic sequence of a gene. Mutation is commonly caused by mutagens (chemical substances that induce mutation), DNA replication mistakes or errors etc.
According to this question, if DNA replication occurs without error, this means that mutation will likely not occur, leading to a perfect, mutation-free society.
For tetracycline , describe an experiment that you could
use to determine if a bacterial sample taken from a person was
resistant to your antibiotic. Be sure to describe all steps of the
experiment including your independent, dependent and control
variables.
Answer:
penicillin was the first antibiotic discovered. Alexander Fleming discovered it in 1928. It was used widely during World War II. However, the sulfonamides were the first antibiotic class used clinically (in the 1930's). The discovery of antibiotics revolutionized medicine by making once-deadly infections treatable. There are now hundreds of antibiotics, classified into several categories. These antibiotic classes include:
Explanation:
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Color in poison dart frogs is controlled by a single gene with multiple alleles. A blue poison dart frog that is heterozygous for the blue allele (Cb) and red allele (Cr) is crossed to a yellow poison dart frog that is heterozygous for the orange (Co) and yellow (Cy) alleles. Their progeny are 1/2 blue, 1/4 orange, and 1/4 yellow. Determine the order of dominance for the alleles. (Order of dominance is indicated as: A > B > C > D such that A is dominant over all alleles, B is dominant over C and D, C is dominant only to D, and D is recessive to all alleles.)
Answer:
Cb>Cy>Co>Cr
Explanation:
First of al we need to do the Punnett square. As a result we get the genotypes:
CyCb
CyCr
CoCb
CoCr
Because there are no red frogs, red is the least dominant as it isn't expressed in any genotype.
Half of the progeny are blue and half of the possible genotypes contain the blue allele meaning that blue is expressed in all genotypes. This means that blue is the most dominant.
The only alleles left are yellow and orange. We can deduce that yellow is more dominant than orange because one of the parent frogs is yellow and contains the genes for yellow and orange.
As a result blue is the most dominant, yellow is the second most dominant, orange is the third most dominant and red is the least dominant.
Shura listed the steps for protein production in cells.
1. A strand of RNA is made.
2. RNA leaves the nucleus.
3. RNA moves to the ribosome.
4. A protein is made.
Which step is missing?
A. DNA unzips after step 1.
B. DNA unzips before step 1.
C. DNA is replicated after step 3.
D. DNA is replicated before step 3.
Answer:
B. DNA unzips before step 1.
Explanation:
This question is describing the process of gene expression, which is made up of two major stages namely; transcription and translation. Transcription is the process by which mRNA is synthesized from a DNA template while translation is the process where protein (amino acid sequence) is produced using the mRNA transcript.
This stages of gene expression has been summarized in the steps listed by Shura. However, prior to the formation of an mRNA molecule in step 1, the double stranded DNA has to unwind i.e. separate into single strands as initiated by the enzyme RNA polymerase. Therefore, the list should read as follows:
- DNA unzips
- A strand of RNA is made.
- RNA leaves the nucleus.
- RNA moves to the ribosome.
- A protein is made.
How are humans impacting biodiversity in ecosystems around the world? Provide two examples to support your claim.
Answer:
as humans population continues to grow, we're cutting down more trees and occupying more lands to suffice the need of citizens, therefore, decreasing the forest biodiversity. Our plastic bags, as well as wastes, are polluting the ocean and eradicating essential species that are required to sustain a balance ecosystem, therefore, decreasing the biodiversity of the ocean that are required to maintain a balance environment.
Human activities have affected in Biodiversity in the ecosystems negatively and such activities include : i) Indiscriminate hunting/fishing ii) Improper waste disposal
Humans in search of food ( meat ) engage in excessive/indiscriminate hunting of endangered species thereby reducing the Biodiversity of animal species present in the wildlife also excessive fishing activities affects the biodiversity of certain species of fishes in our oceans negatively.
When wastes are not properly disposed they degrade the environment and decrease the biodiversity of the ecosystems in the process. the burning of industrial wastes leads to the exposure of certain species to the negative effects of dangerous gases and liquids thereby making the ecosystems to become unbalanced.
Hence we can conclude that some of the human activities impacting biodiversity in ecosystems around the world include : Indiscriminate hunting/fishing and Improper waste disposal
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Do food chains and food webs show the pathway that energy travel through an ecosystem?
Answer:
Yes
Explanation:
Yes, because everytime an animal eats another animal or plant the energy that was inside that plant or animal transfers to the consumer.
How do the vacuoles and cytoplasm contribute to maintaining homeostasis in a cell?
Answer:
Vacuoles regulate the turgidity by regulating the amount of water inside the cell. cell has excessive water: vacuole absorbs the water and then diffuses it out of the cell. cell lacks water: water from the vacuole gets passed back into the cell thereby maintaining turgidity
where is the most energy stored in the ATP molecule stored
Identify the changes as either chemical (C) or physical (P). If chemical, what is the evidence?
Burning a piece of paper
Tearing a piece of paper
Digesting food
Heating a cup of water
Mixing baking soda and vinegar
Mixing calcium chloride and water
Answer:
1). P
2 C
3 P
4 P
5. P
Explanation:
THSE Answer are right a
Identify the following particles as being charged or uncharged/neutral. If charged, indicate whether they are charged positively or negatively. (n = neutron, p = proton, e = electron)
*particle C
proton +20
electron -18
urgent ^^
Answer:
Particle A is negatively charged.
Particle B is neutral.
Particle C is positively charged.
Explanation:
Particle A is negatively charged because the number of electrons is more than number of protons so the particle gain negative charge. Particle A is neutral due to same number of proton and electron which cancels the effect of one another and become neutral whereas the Particle B is positively charged due presence of more number of protons as compared to number of electrons so the particle gain positive charge.