Lancelets Live In

Q21: Mammals have a _heart.

Q50: _are mammals that lay eggs.)

Q70: An animal without a vertebral column has

Q71: Mammals have the most complex nervous system

Q72: Which vertebrate group is the most diverse?<br>A)Actinopterygii<br>B)Actinistia<br>C)Chondrichthyes<br>D)Mammalia<br>E)Reptilia

Q73: This animal is classified as a: <img

Q76: Which vertebrate group has a three-chambered heart?<br>A)lobe-finned

Q78: All chordates have:<br>A)a ventral, hollow nerve cord.<br>B)a

Q103: Why do amphibians need to live in

Q108: What characteristics differentiate monotremes from other mammals?