Plants on Earth provide food, some even provide shelter to some animals, and plants such as trees provide oxygen to the environment.
I think calcium but i could be wrong
There are several ways selection can affect population variation:
stabilizing selection
directional selection
diversifying selection
frequency-dependent selection
sexual selection
As natural selection influences the allele frequencies in a population, individuals can either become more or less genetically similar and the phenotypes displayed can become more similar or more disparate. In the end, natural selection cannot produce perfect organisms from scratch, it can only generate populations that are better adapted to survive and successfully reproduce in their environments through the aforementioned selections.
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Answer:
The cell membrane is permeable to small solutes to let them easily diffuse in and out of the cells.
Answer:
B,the variable that is changed and being tested
