What happens during the Krebs Cycle? A. ATP and NADH from food are converted to CO₂ and O₂
B. NADH from glycolysis is converted to ATP and O₂ molecules
C. Glucose is broken down in a cycle of reactions to form pyruvate
D. Pyruvate is broken down in a series of reactions to form CO₂

Energy derived from hot rocks and fluids beneath the earth’s surface is

Building glycogen from glucose molecules is an example of what

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 .