3. A freshwater ecosystem has a sandy bottom with few rocks. Invertebrates and algae live near the bottom among the rocks. Plankton live at various depths in the water. Different species of fish feed on algae, plankton and other fish. Which of these is an abiotic factor in the ecosystem? A. temperature of the water B. the number of species of algae

C. amount of food available to the fish D. the amount of plankton

Correct

Incorrect answers and why: