Question

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Answer 1

Answer:

i=nostrils

ii=bronchioles

iii=spiracles

iv=cell

v=breathing in + breathing out

vi=airsacs

Explanation:

hope this helps

Answer 2

Answer:

I.

i. nostrils

ii. bronchioles

iii. spiracles

iv. cell itself

v. respiratory cycle

vi. alveoli

II.

sleeping < watching T.V. < brisk walk < cycling

All the different activities require different amounts of energy. So the breathe rate changes under different circumstances.