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vesna_86 [32]
3 years ago
13

What are the two main a biotic factor that affect organisms in a marine ecosystem​

Biology
1 answer:
zepelin [54]3 years ago
8 0

Answer:

one of these a or b i know that much

Explanation:

my bad

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The stethoscope is a device commonly used by doctors to monitor heart function. When listening to a heart beating using a stetho
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Answer:

The correct answers are:

1. closing

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3. a constricted trachea

Lub is the first sound of a heartbeat and is mentioned as S1. It is usually produced due to the closing of tricuspid and and mitral or bicuspid valves present between atria and ventricles.

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