What types of organisms serve as the producers at the bottom of the
ocean?
A. seaweed
B. sulfur bacteria
C. seahorses

What are some things that limit population growth?

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

Which environmental change would most likely result in bullfrog offspring that are able to store more water than bullfrogs in previous generations?