locomotive adaptations

Question 1

five main classes of vertebrates

Answer 1

fish, amphibians, reptiles, mammals and birds

Question 2

exo and endo skeleton

Answer 2

exoskeleton- dermis giving rise to bone and
the epidermis to keratin, formed from or within integument
endoskeleton- formed from mesoderm deep in body, from bone, cartilage, fribrous connective tissue not directly from integument