Poison Dart Frogs Live in Tropical Rain Forests

Multiple Choice

Poison dart frogs live in tropical rain forests.They have a powerful toxin in their skin and are typically brightly colored, advertising their distastefulness to would-be predators.Why would frogs likely evolve this method of defense against predators?

A) No predators are able to overcome toxins.
B) It is an effective method for small, weak prey.
C) It is easier to evolve than methods such as crypsis.
D) Most predators quickly become insensitive to toxins.
E) Most tropical predators locate prey by sound, not sight.