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
Answer:
it is the x gene mutation
That's at least one of his parents are heterozygous
Probably water. Abiotic means not living, such as sunlight or water.
