What structure prevents blood from flowing backward in the heart?
2 answers:
Answer:
chicken
Explanation:
wing
Explanation:
<h3>Tricuspid valve.</h3>
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C. Obesity
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C- they are just as effective as making your own protein shake at home
Answer:
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<span>B. Primitive life-forms, such as molds or yeasts, that cannot make their own food.
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