Answer:
Cells produce CO2 and use O2 thats why there is less oxygen in exhaled air bc cells used some and more CO2 bc body gets rid off extra CO2 like that
Explanation:
I hope I did't over complicate
It is Convergent evolution
2. C (2, 1, 4, 3)
3. A (Determine the volume by how much water it displaces, then divide mass by volume)
4. H (Water all the containers the same amount and at the same time)
5. A (1.7 mL)