Why dna replication is more complex ineukaryoyes than in bacteria

What part of the brain is highlighted in the diagram below?

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 .

In what part of the body does the most muscle activity happen?