To eliminate the possibility of hidden or unknown variables, the scientist must run a experiment. a) control b) preliminary c) test d) variable

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 .

If a cell is placed into a hypertonic environment,what will happen to it ? a)it will shrink or shrivel b)nothing c)it will burst d) it will expand or enlarge

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called