Answer:
Botany, Zoology and Microbiology
Explanation:
These are the main studies/branches of Biology.
Carbon dioxide.
a gas produced by animals during respiration that plants use to make food, water, and oxygen.
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The answer is a “gene”
A gene is a functional segment of DNA that provides the genetic information necessary to build a protein. Each particular gene provides the code necessary to construct a particular protein.
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