Define vertebrate animals and endoskeleton.

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Define vertebrate animals and endoskeleton.
Animals that have their bones or skeleton inside their body possess an endoskeleton. These animals are known as vertebrate animals.
List the groups of vertebrates.
There are five main groups of vertebrate animals: Mammals, Fish, Amphibians, Reptiles, and Birds (the text likely meant "Birds" instead of "FEELS").
Explain the spine.
All vertebrate animals have a spine (also known as the vertebral column). The spine is made up of smaller bones called vertebrae, which protect the spinal cord (the text incorrectly refers to the bones as "spinal cords").

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