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
Pretty sure it's 2. She dyed her hair red so that means she does not have the genes for red hair. If she did, it would be passed to her kids with sex cells
false not all scientists believe in evolution
Biotic= living like trees, animals,
