Biology, asked by ndevi8276, 6 months ago

skin
8. Which of these helps to pull in oxygen-rich air into the lungs?
a. Expansion of the diaphragm
c. Up and down movement of the ribs d. Tracheal tubes
b. Relaxation of the diaph

Answers

Answered by Shee190505

1

Answer:

a

Explanation:

Expansion of diaphram

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