Final answer:
Gerbils are members of the animal order Rodentia, which is known for mammals that have continuously growing incisors, like rats and mice.
Step-by-step explanation:
Gerbils are members of the animal order known for their characteristic gnawing behavior and continually growing incisors to maintain tooth length through gnawing. This order, Rodentia, includes other small mammals such as rats, mice, and squirrels. The correct answer to the question, which animal order gerbils belong to with their impressive incisors, is A) Rodentia.
This order is distinct from others like Carnivora, which includes meat-eating mammals such as cats and dogs, and Primates, which includes humans and monkeys with their larger brains and advanced hand and foot development. Key identifying features of rodents include a single pair of growing incisors in both the upper and lower jaws.