Answer:
A. breaking down food into nutrients
Step-by-step explanation:
Homeostasis is the ability of the human body to regulate itself or achieve internal stability. If a body's conditions can not be regulated, it may result to the break down of its immune system leading to infections, diseases or disorder.
To maintain homeostasis, the circulatory system transports oxygen-rich blood to other parts of the body. So that the immediate condition can be regulated. It works with the respiratory system, delivering nutrients to other parts of the body. It also remove wastes from our body.
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