3 years ago

How do the respiratory and circulatory systems work together?

1 answer:

7 0

The respiratory system brings air into the lungs supplying the blood with oxygen. Oxygen is carried throughout the body to the organs and keeps the heart pumping and when the blood circulates back to the lungs the process starts over again.

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3 years ago

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2 years ago

Which example describes an inherited trait that cannot be determined by observing an individual?

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