Cell Theory states: I. All living cells must have a cell wall. II. All living cells require glucose for survival. III. The basic unit of life is a cell membrane.

Which statements about a food chain are true? choose all answers that are correct. a.plants are the first living organisms in food chains on land. b. the plants in a food chain are called herbivores. c. all food chains on land begin with energy from the sun. d. carnivores in a food chain eat only plants.