Mollusks are a major food source for other organisms, including humans.
Mollusks are invertebrates and are no exception.
Invertebrates are a major food source for other organisms, including humans.
What is a major food source for other organisms, including humans?
a: gastropod shells
b: orchids
c: invertebrates
d: swamp vegetation
e: Most plants
f: insects
g: barnacles
h: animals