Animals

Mammals are warm-blooded animals that have hair or fur and usually give birth to live young. They also feed their young with milk.

Endotherms are animals that can regulate their body temperature internally, maintaining a constant temperature regardless of the environment. Examples include mammals and birds.

All mammals have mammary glands that produce milk to feed their young.

Vertebrates have a backbone, while invertebrates do not have a backbone.

Echinoderms are a group of marine invertebrates that include starfish, sea urchins, and sea cucumbers. They are closely related to vertebrates.

Invertebrates do not have a backbone.

Examples of endothermic animals include mammals and birds.

Hair or fur helps mammals regulate their body temperature and provides insulation.

Mammary glands produce milk to nourish and feed the young.

Humans are classified as mammals.