A scientist wants to change the sequence of nitrogen bases in a DNA strand. Which of the following should the scientists do? 1.Add in more phosphates to the DNA
2. Change the order of nucleotides
3.change number of hydrogen bases
4. Remove some of the sugars

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 .