What is meant by Earth's "Lag Period"?

The transport tubes from food came down the plant are called?

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 .

Compare and contrast your sells take in oxygen, water, and food. what is one waste product that leaves your cells?