What happens when the pressure in the ventricles becomes lower than the pressure in the atria?   a-the atrioventricular valves open b-the semilunar valves close c-the semilunar valves open d-the first heart sound occurs

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A: Introduction: Tofu, which is also sometimes called tofu cheese is a soya product.

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A:

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A:

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Q: What are the main elements of the lac operon and their functions?

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A: The correct Answer is C

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