Using the concepts of trophic levels and energy flow,
explain why the ecological footprint of a vegetarian
person is smaller than that of a meat-eater.

What happens when two galaxies approach each other? a. they form a black hole. b. they merge because of the strong gravitational pull they exert on each other. c. they shred each other into smaller galaxies. d. they form a supernova. e. they repel each other away because of their strong gravitational pull.