question: a toxin is used for defense by what?
choices.text: each species related organisms quail prokaryotic cells dogs antigens sea anemones humans
choices.label: A B C D E F G H
fact2: Poison dart frogs are the source of a toxin used by natives on their poison darts.
combinedfact: a toxin is used for defense by sea anemones
formatted_question: a toxin is used for defense by what? (A) each species (B) related organisms (C) quail (D) prokaryotic cells (E) dogs (F) antigens (G) sea anemones (H) humans