Answer the following question given this paragraph: 

As you can see in Figure below , both body plans have radial symmetry. Some cnidarian species alternate between medusa and polyp forms. Other species exist in just one form or the other.


Q: What type of species can alternate between medusa and polyp forms?

 Choices:

- mollusks

- crocodilian

- chordata

- cnidarian

A:
cnidarian
