A Cnidarian, Which is Radially Symmetrical, Has Germ Layer(s)

Question

A cnidarian, which is radially symmetrical, has germ layer(s).
A) no
B) one
C) two
D) three
E) four

Accepted Answer

Cnidarians have two germ layers: the ectoderm (outer layer) and endoderm (inner layer). They do not have a mesoderm, which is a third germ layer found in more complex animals.