Answer:
B
Explanation:
I looked it up as well as thought
It's the Immune system!
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Answer: No
Explanation: It is beneficial if the animals that are disadvantageous doesn't reproduce so it doesn't discredit natural selection. The traits in which variation is occured are more suitable for organism to live and reproduce in the environment are preserved and are passed from generation to generation.
However, natural selection effects limited number of progeny.
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Folic acid is a necessary component of the diet of pregnant women in order to prevent neural tube defects.
