Why are enzymes important? a) enzymes are complete proteins essential for good health. b) enzymes break down proteins for use in the body. c) enzymes carry oxygen to other organs in the body. d) enzymes make up muscle tissue in the body.

Which two molecules do green plants use to make glucose? o a. nitrogen and water o b. hydrogen and oxygen o c. carbon dioxide and water o d. methane and iron oxide

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.