The differences between environmental science and ecology is:
environmental science is the study of how the environment interacts and operates while ecology is the study of the ecosystem, which is the relationship between the environment and living organism.
So the difference is that environmental science doesn't really emphasise relationship like ecology does.
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Genetic variation allows for mutations to occurs where survival of the fittest occurs. This makes sure that the most adapted creatures survive and are able to pass their genes on to offspring. Thus causing evolution.
The answers are solar for the first one, and chemical for the second one
A person should know the effect of auxins as it helps in growth of the stems and the person should know how much he should cut otherwise will keep cutting it non uniformly affecting the plant growth and exposure to sunlight.
D. Photosynthesis only takes place in the light, while cellular respiration takes place in the light and dark.