A student took her pulse three times while lying at rest and recorded the following values: 16 beats, 20 beats, and 18 beats in 20 seconds. the average resting heart rate for the student is 21 beats/minute
42 beats/minute
54 beats/minute
72 beats/minute
90 beats/minute

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 .