Question

What is respiration?
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Answer 1

Explanation:

respiration is the movement of oxygen from the outside environment to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

Answer 2

Answer:

Respiration is the movement of air or dissolved gases into and out of the lungs

It is a single complete act of breathing

Explanation:

The physical and chemical processes (such as breathing and diffusion) by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions.