Which term best describes the group that includes Norway rats and house mice when found in structures?

Which term best describes the group that includes Norway rats and house mice when found in structures?

• A. Rodents
• B. Primates
• C. Marsupials
• D. Reptiles

Answer: (A)

Rodents are the group that includes Norway rats and house mice. They belong to the mammal order Rodentia, defined by a pair of continually growing incisor teeth that must be gnawed down. This dental feature is a hallmark of rodents and helps explain why these animals are so adept at accessing food and invading structures. In structures, these species are classic examples of rodents because they share this characteristic dental adaptation, along with typical mammalian traits like fur and live birth. They are not primates (which include humans and apes), not marsupials (that have pouches), and not reptiles (cold-blooded vertebrates with scales), so the best term to describe them in this context is rodents.

Rodents are the group that includes Norway rats and house mice. They belong to the mammal order Rodentia, defined by a pair of continually growing incisor teeth that must be gnawed down. This dental feature is a hallmark of rodents and helps explain why these animals are so adept at accessing food and invading structures. In structures, these species are classic examples of rodents because they share this characteristic dental adaptation, along with typical mammalian traits like fur and live birth. They are not primates (which include humans and apes), not marsupials (that have pouches), and not reptiles (cold-blooded vertebrates with scales), so the best term to describe them in this context is rodents.