The words in the bottom row are related in the same way as the words in the top row. For each item, find the word that completes the bottom row of words.

tadpole	frog	amphibian
lamb	sheep	?

The tadpole is a young frog; frogs are amphibians. The lamb is a young sheep; sheep are mammals. Animal (choice a) is incorrect because it is too large a grouping: Animals include insects, birds, mammals, reptiles, and amphibians. Choices b and c are incorrect because they are not part of the progression.