Answer the following question given this paragraph: 

Cnidarians such as jellyfish have radial symmetry. Flatworms and roundworms, which you will read about next, have bilateral symmetry.


Q: What are jellyfish and other cnidarian's stingers called?

 Choices:

- prokaryotes

- necrocytes

- phenocrysts

- nematocysts

A:
nematocysts
