Early systems of classification grouped organisms into two main categories, plants and animals, based on visible characteristics. today, organisms are classified by domains (or superkingdoms) and by kingdoms (and subgroups of phyla, classes, orders, families, genuses, and species). how many domains and kingdoms are in the modern system of taxonomy?

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 .