the light of proxima centauri takes about 4.22 years to reach earth suggesting that its distance from earth is what?

Structures in cells that carry out specific functions.

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.

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a