Answer:
Polygenic traits are traits that are controlled by multiple genes instead of just one. The genes that control them may be located near each other or even on separate chromosomes. Some examples of polygenic traits are height, skin color, eye color, and hair color.
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Step by step explaintion:
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an increase in atmospheric carbon dioxide
Answer: D
The correct answer is A. This is because undeveloped meaning they don't have access to any of the other offered answers
