In meiosis crossing over occurs. Crossing over is? A. important to create more variation.

B. what makes a cell become cancerous.

C. key process in body cell formation

Environmental impacts on evolution : mastery test

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.