Which of the following is a rodent?

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Multiple Choice

Which of the following is a rodent?

Explanation:
Rodents are mammals placed in the order Rodentia, defined mainly by a pair of incisors in each jaw that grow continuously and are kept sharp by gnawing. The rat fits this group perfectly, as it has large, ever-growing incisors used for gnawing. The other animals belong to different mammal groups: the dolphin is a cetacean, the elephant a proboscidean, and the bear a carnivoran. Because only the rat has the continuously growing incisors characteristic of rodents and belongs to Rodentia, it is the correct choice.

Rodents are mammals placed in the order Rodentia, defined mainly by a pair of incisors in each jaw that grow continuously and are kept sharp by gnawing. The rat fits this group perfectly, as it has large, ever-growing incisors used for gnawing. The other animals belong to different mammal groups: the dolphin is a cetacean, the elephant a proboscidean, and the bear a carnivoran. Because only the rat has the continuously growing incisors characteristic of rodents and belongs to Rodentia, it is the correct choice.

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