A vertebrate is an animal that has a backbone o a spinal column.

All invertebrates are cold-blooded.

All invertebrates are exoskeletons.

An invertebrate does not have a backbone, but has a spinal column.

Animals need to feed themselves by eating plants, other animals or a combination of plants and animals.

Because fish need heat underwater, they are warm-blooded animals.

Birds are warm-blooded animals.

Cold-blooded animals cannot maintain their body temperature.

Cold-blooded animals do regulate their body temperature by moving to a more suitable environment.

Endoskeleton refers to the skeleton inside the bodies of vertebrates.

Humans are animals.

Humans are mammals.

Mammals are not animals.

Warm-blooded animals are always hot.

Some invertebrates do not have skeleton at all.