Air moves from the pharynx through the or voice box

The model illustrates a process by which a substance is taken up by a cell

20 the compound al(nh3)2 has atoms of nitrogen.

The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations