Answer:
A. 30:2
Explanation:
After every 30 chest compressions at a rate of 100 to 120 a minute, give 2 breaths.
It allows Nutrients and waste substances to pass through them
Answer: true is your answer hope this helped
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Explanation:
A large protein molecule responsible for facilitating biochemical reactions within the body. ... Chemical substances that are absorbed by the body through the process of digestion. nutrition. The proper supply of nutrients essential for growth, reproduction, repair, immunity, and energy.
D