Q: What is the radula made mostly of?


Read this paragraph and choose the correct option from the provided answers:

Many species have a feeding structure, the radula , found only in mollusks. The radula can be thought of as a "tongue-like" structure. The radula is made mostly of chitin. Types of radulae range from structures used to scrape algae off of rocks to the beaks of squid and octopuses.

 Choices:

- casein

- chlorophyll

- schist

- chitin


A:
chitin