Correct option is C
1. Butterflies: Some butterfly species are poisonous. For example, the Monarch butterfly (Danaus plexippus) is known for its toxicity. Monarch caterpillars feed on milkweed plants, which contain toxic compounds called cardenolides. These toxins are retained in the adult butterflies, making them poisonous to predators. The bright coloration of these butterflies serves as a warning sign (aposematism) to potential predators.
2. Fish: Many species of fish are poisonous. A well-known example is the Pufferfish (family Tetraodontidae), which contains a potent toxin called tetrodotoxin. This toxin is highly lethal and can cause paralysis and death in predators, including humans. Another example is the Stonefish (genus Synanceia), which possesses venomous spines capable of delivering a dangerous sting.
3. Frogs: Numerous frog species are poisonous. The most famous are the Poison Dart Frogs (family Dendrobatidae) from Central and South America. These frogs have skin that secretes potent toxins, which indigenous people historically used to poison the tips of blow darts. The level of toxicity varies among species, but some can be lethal to humans and other animals.
