Research has identified a species from the west coast of the United States that may have been the ancestor of 28 distinct species on the Hawaiian Islands. What is this species

it creates acid rain

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.