Multiple choice

Tricuspid valves are found in

  1. all mammals

  2. all vertebrates

  3. prototherians

  4. walrus
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A Correct answer
Explanation

Tricuspid valves are a characteristic feature of the mammalian heart, specifically located between the right atrium and right ventricle. While prototherians (egg-laying mammals) are indeed mammals, they still possess this valve structure as it is fundamental to mammalian circulatory anatomy.

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