Earthworms have a (n), birds have a (n), and spiders have a (n). Endo exo or hydroskeleton these choices are used for all three

The types of skeleton depend on where they are located. Earthworms have hydroskeleton because their rigid bodies are based on water pressure so it's hydro then. Endo is found in animals like birds and also humans who have it inside. Exo is found in spiders because they are bugs and bugs have their skeletons like a shell that covers them.

Earthworms have a hydro

birds have an endo

spiders have an exo