Question

which class of organisms skeletons are made of both bones and cartilage and are cold blooded

Answer 1

may be your answer is CLASS PISCES.

1) cold blooded

2) Two types of fishes :

i) in cartilaginous fishes internal skeleton is cartilage.

ii) while in bony fishes it is mad up of bone.

hope that helps you ⭐⭐⭐!