In the genetic code,
a) some amino acids are not specified by any codons
b) many amino acids are specified by more than one codon
c) some codons consist of two nucleotides
d) some codons specify more than one amino acid

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .