Invertebrates, due to lack of a spine.
they are both
Vetebrates and protochordates.
eggs
An invertebrate is any animal that does not have a backbone.
jellies, octopus, and slugs.
vetebrates
Yes, horses are vetebrates and mammals.Yes. :-)
yaks have 3000000 vetebrates
Some do, some don't.
how do phyla of vetebrates vary
yes, pill bugs are invetebrates they have no back bone
Invetebrates have no backbone (or skeletal system at all).