Which Chordate Trait Evolved First

Q32: All vertebrates have _.<br>A)hair and a backbone<br>B)a

Q33: How might an early primate's environment lead

Q34: Many, though not all, mollusks have a

Q35: All mammals _.<br>A)give birth to live young<br>B)are

Q36: Parasites have often been described incorrectly as

Q38: What is an amniotic egg?<br>A)A type of

Q39: Humans belong to which subgroup of mammals?<br>A)Marsupials<br>B)Monotremes<br>C)Eutherians<br>D)Cetaceans

Q40: Which body form of the cnidarians is

Q41: Which is most closely related to the

Q42: What happened during the Cambrian explosion?<br>A)Many large