The Rough-Skinned Newt Produces One of the Most Potent Toxins

The rough-skinned newt produces one of the most potent toxins on the planet. Scientists in Oregon have found that as newts evolve to produce a more deadly toxin, their primary predator, the garter snake, evolves ways to resist the toxin. This is an example of

A) ecological trade-offs in the evolution of the newt.
B) an adaptation of the newt to living in aquatic environments.
C) reproductive isolation in a population of garter snakes.
D) coevolution of predator and prey.