1) What innovation allowed vertebrates to become successful on land.
A) scales
B) bony skeletons
C) warm-bloodedness
D) amniotic egg
2) Which has as a ventral nerve cord:
A)Cnidaria;
B)Porifera;
C)Arthropoda;
D)Chordata
Press A but Again
A
B
Por favor espera - en proceso…