Choose the word that best completes each sentence.

Invertebrates may have an for protection and support.

Vertebrates have a backbone and an .

1) exoskeleton  2) endoskeleton

Explanation:

Explanation:

Invertebrates are usually small animals, they usually lack of an articulated internal skeleton, although some do, but it is an external skeleton called an exoskeleton.  Many have shells, shells, or covers of some hard substance.

A vertebrate is an animal that has a skeleton with a vertebral column and a skull, and whose central nervous system is made up of the spinal cord and the brain.

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