Ancestors of hagfish are thought to have been the earliest creatures with what?
pigment bones keratin life shells size wings arms
A B C D E F G H
Bone is found only in vertebrates .
Ancestors of hagfish are thought to have been the earliest creatures with bones
Ancestors of hagfish are thought to have been the earliest creatures with what? (A) pigment (B) bones (C) keratin (D) life (E) shells (F) size (G) wings (H) arms