Mrs. rushing has 3 chemistry classes with 24 students in each. an experiment calls for each student to use 4 test tubes.
how many test tubes are needed in all for her classes?

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 .