Question

1.
Fill in the blanks.
a.
Exchange of gas happens through____
b.________ is a large elastic muscular are bag-like organ just under our navel or belly button.
c. when diaphragm expands, it ______ lungs up and air _______ lungs.
d. the trachea is also know as the _____.
e. ___________ is the process of eliminating toxic wastes such as urea and extra water from the body.
please fill in the blanks
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Answer 1

Answer:

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