Which of the following is not a characteristic of mammals?

Question

become hotter or colder with outside temperature

produce milk for young

have hair on their bodies

have a backbone

Answer 1

The characteristic that is not typical of mammals is "become hotter or colder with outside temperature." Mammals are endothermic (warm-blooded), meaning they maintain a constant body temperature regardless of the environment. The other characteristics—producing milk for their young, having hair on their bodies, and having a backbone—are all defining traits of mammals.