What is the primary problem with the secular view of ice ages

What are genotypes? what are phenotypes?

Recommend a strategy for incorporating sustainable human activity into a tropical rain forest biome.

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 .