If you wanted to buy an aquarium with only plankton in it which of the following would you buy ?
a. the tank is full with organisms that use the sun to make food as they drift through the water
b. organisms in this tank are attached to the bottom but use the sun to make food
c. this tank is full with of organisms that eat the remains of the other living things as food
d. this tanks has swimming and crawling organisms that need to be fed daily