What is a telomere? What does it do for the chromosome? Please help I’m taking a quiz that’s way over do.

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

All other things being equal the size of a population will decrease if