Answer the following question given this paragraph: 

Sponges have an internal skeleton that gives them support and protection. An internal skeleton is called an endoskeleton . A sponge endoskeleton consists of short, sharp rods called spicules (see Figure below ). Spicules are made of silica, calcium carbonate, or spongin, a tough protein. They grow from specialized cells in the body of the sponge.


Q: Sponges possess an internal skeleton called what?

 Choices:

- hydrostatic skeleton

- fluid skeleton

- exoskelton

- endoskeleton

A:
endoskeleton
