What features do cephalochordates lack that vertabates have

The mitochondrion functions lipid storage protein synthesis photosynthesis dna replication atp synthesis

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.

How does natural selection change thephenotypes within a population over time?