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Len [333]
3 years ago
15

The four principal types of stress are __________.

Biology
1 answer:
stealth61 [152]3 years ago
7 0

Answer:

A

Explanation:

frustration, conflict, pressure, and anxiety

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The Mitral valve which is also known as left atrioventricular prevents blood movement from left ventricle to left atrium.

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