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Your answer is:
There are alternate versions of a gene.
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Answer: Membrane transport proteins are specific and selective for the molecules they move, and they often use energy to catalyze passage. Also, these proteins transport some nutrients against the concentration gradient, which requires additional energy.
Explanation:
Answer:
Specie
Explanation:
They are a group that interbreed with each other, only, since they cannot produce fertile offspring with those of another species.
Answer:
The first and 2nd pictures basically capture what they look like.
What is the choices for the blank?
