Directions: The question below consists of a word, followed by four words or phrases. Choose the word or phrase that is closest in meaning to the given word.

Amphibian

An amphibian is a vertebrate animal that typically lives both on land and in water, like frogs, toads, and salamanders. A caecilian is indeed a type of amphibian - specifically a limbless, burrowing amphibian that resembles a snake. The other options are incorrect: 'funny,' 'within,' and 'increase' are unrelated to biological classification.