One reason alternative energy sources are needed is because A. the energy needs of the world are decreasing
B. there is no limit to the supply of fossil fuels
C. the population of the world is decreasing
D. the supply of fossil fuel is diminishing

Complete the statements to identify the first two steps of meiosis i. (1 ) the first and longest step of meiosis i is called i. (2)the second step of meiosis i is called i.

In the water cycle , when does water undergo a chemical change

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 .