This is the pond behind Serge's house. There are lots of catfish swimming in this pond. Trees ring the pond and rushes and irises live at the pond's edge. The bottom of the pond is sandy and Serge likes to pick up flat rocks from the shallow water and skim them across the top of the water. This summer, Serge has seen lots of dragon flies and mosquitoes at the pond also. All the catfish that live in the pond behind Serge's house make up a of catfish.

a. community
b. family
c. habitat
d. population