A) A flap in the heart located between each atrium and ventricle.
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Apparently it is ATP as deduced from the last line of text and no model to refer to.
Answer:
sister taxa
Explanation:
Groups departing from the same evolutionary node are called sister taxa and are evolutionarily closer to each other than groups departing from another node. Thus, we can say that the sister taxa are evolutionarily closer (related) to each other than to the taxa that did not diverge from the same place. Similarly we can say that taxa that did not diverge from the same place, cannot be called sister taxa and are distant evolutionary.
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