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Veronika [31]
2 years ago
13

Why does the heart automatically adjust the flow of blood to match activity levels?

Biology
2 answers:
Sliva [168]2 years ago
4 0

Answer:

C

Explanation:

it builds up higher level of oxygen in the bloof

Lilit [14]2 years ago
4 0
The answer to your question is D
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