Question

b) Fill in the blanks
When we
air containing 21%
enters the respiratory system through
the mouth and the nose. The air passes through the
and the trachea into the two
which divide into many bronchioles. The air passes into these
which
When
Gaseous exchange takes place in these
connect to tiny sacs called
we erhale, air containing less
but much more
goes
back from the alveoli to the bronchioles and then to the bronchi. From the bronchi, air goes
back to the
and then goes out of the respiratory system
through the​

Answer 1

Answer:

16%

Explanation:

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