How does the poison dart frog obtain its toxicity?

The correct choice highlights that the poison dart frog's toxicity is largely derived from its diet, specifically from consuming certain species of ants, mites, and termites. These food sources contain potent alkaloids that the frogs accumulate in their bodies. The frogs themselves do not produce these toxins; rather, they assimilate them during their feeding process. Once ingested, these compounds are stored in the frogs' skin and serve as a defense mechanism against predators, effectively making the frogs toxic.

The frogs that are raised in captivity and lack access to these specific insects do not develop toxicity, further supporting the significance of their natural diet in acquiring poisonous traits. This relationship between their dietary habits and toxicity illustrates a fascinating example of how environmental factors influence physiological traits in organisms.