Question

Which organism is a secondary consumer (3rd trophic level)? a. larvae b. copepods c. killifish d. snapper

Answer 1

ANSWER:  B, killifish

REASONING: A secondary consumer consumes animals that eat only plants.  Larvae and copepods do not fit these descriptions, because they do not eat animals.  Snapper do eat animals, so do not fit the description either.  Killifish eat small animals that do eat plants.