Question

why do we breathe in and out
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Answer 1

Answer:

All cells in our body need oxygen to create energy efficiently. When the cells create energy, however, they make carbon dioxide. We get oxygen by breathing in fresh air, and we remove carbon dioxide from the body by breathing out stale air.

Answer 2

Answer:

for living we need air for breathe if we not take breathe we cannot survive it is necessary for life.