Answer:
because that one sperm cell have the 23 chromosomes to mix with the 23 in the egg.... to fertilize it
Explanation:
Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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Gut bacteria include Lactobacillus, the bacteria commonly used in probiotic foods such as yogurt, and E. coli bacteria. About a third of all bacteria in the gut are members of the Bacteroides species. Bacteroides are key in helping us digest plant food.