Page 103 - Science

• Birds, mammals, amphibians belong to a

group called -______________.

• vertebrates.

• Vertebrates are _________________

• animals with backbones.

• Invertebrates are ___________

• animals without backbones.

• Vertebrates have ______________

• skeletons inside their bodies.

• Internal skeletons are known as _________.

endoskeleton.

• External / outside skeletons are called

• exoskeleton.