AP BIOLOGY

Detailed explanation-1: -The class of warm blooded, usually hairy animals, that feed their young with milk produced by mothers. This class includes monotremes, marsupials, primates, cats, dogs, bears, hoofed animals, rodents, bats, seals, dolphins, and whales.

Detailed explanation-2: -Answer: All mammals have fur or hair, give birth to live young, have lungs and need air to breathe, are warm blooded, have four limbs if they live on land, and feed their babies milk from their breasts.

Detailed explanation-3: -1. What five characteristics do mammals have in common? Mammals have hair or fur; are warm-blooded; most are born alive; the young are fed milk produced by the mother’s mammary glands; and they have a more complex brain than other animals.

Detailed explanation-4: -Answer and Explanation: Placentals are endothermic. This is because placentals are mammals and mammals are endothermic. An endothermic animal is one whose internal body temperature is controlled by the organism itself and not determined by the temperature of the organism’s surroundings.