What is the process in which muscles contact to move food throughout the digestive system

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 .

Which organelle plays a role in intracellular digestion?

Interferons play a vital role in the immune system why are interferons so important?