a. photosynthesis
b. evaporation
c. burning of fossil fuels
d. respiration of plants and animals

23. Whose diet requires the most land area to support it?

a. a carnivore who eats only meat
b. a vegetarian who eats only plants
c. an omnivore who eats both plants and animals
d. a decomposer who eats dead plants and animals

25. Where does your body get the energy to counteract the effects of entropy (Entropy is the tendency of all matter to get disorganized.)?

a. regular exercise
b. sunbathing
c. food
d. water
e. vitamin supplements

27. Which of the following organisms never do photosynthesis?

a. plants
b. algae
c. any bacteria
d. fungi