The answer is geographic distribution
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The answer to this question is; A
Mendel had true-breeding pea plants that, if allowed to self-pollinate, would produce offspring identical to themselves.
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Anemia is a medical condition in which there is a decrease int the total amount of red blood cells in the blood and it always results in lowered ability of the blood to carry oxygen. Vitamin B12 is needed to make red blood cells and lack of Vitamin B12 can lead to aneamia. So, the vitamin that is most associated with aneamia condition is VITAMIN B12.