Respuesta :
The word that completed each sentence should be
1. exoskeleton
2. endoskeleton
What are exoskeleton and endoskeleton?
An exoskeleton refers to the skeleton that is external in nature at the same time it supports and protects the body of the animal. While on the other hand, the endoskeleton refers to the internal skeltion. So we can say that invertebrates should contain the exoskeleton with respect to protection and support. While the vertebrates should contain the backbone also the endoskeleton.
Learn more about Invertebrates here: https://brainly.com/question/21582240
