What is an organelle?
a. a small structure within a cell that serves specialized function
b. a specialized protein that speeds up chemical reactions
c. packets within the cell cytoplasm that contain powerful enzymes
d. the semipermeable membrane surrounding a cell

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 .