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elixir [45]
2 years ago
14

What prevents the blood in veins from flowing in the wrong direction?.

Biology
1 answer:
torisob [31]2 years ago
7 0

Answer:

The heart valves

Explanation:

The heart valves prevent blood from flowing in the wrong direction in the heart. The valves are held in the proper place because of the chordae tendinae.

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Considering the answers;
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The answer will be E. 
If no other species can hybridize, then species W and Y are still sibling species, shared a common ancestor more recently with each other than either did with the other two species and also may merge into a single species if their hybrids remain fertile over the course of many generations. 
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Answer:

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Explanation:

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