Fact 1: Phytoplankton are bacteria and algae that use sunlight to make food. Fact 2: Since fish feed on phytoplankton, they are drawn to phytoplankton-rich waters. Given the two facts above, what do fish feed on?

OPTIONS:
A). rocks
B). embryos
C). pizza
D). algae
E). energy
F). insects
G). gills
H). food
Answer:
D).