Question

what class of mollusks have two shells?
cephalopods
bivalves
gastropods

Explanation:

To determine the class of mollusks with two shells, we analyze the options:

• Cephalopods (e.g., octopuses, squids) typically have either a reduced shell or no external shell.
• Bivalves (e.g., clams, mussels, oysters) are defined by having a two - part (bivalve) shell that is hinged.
• Gastropods (e.g., snails, slugs) usually have a single, coiled shell (or no shell in the case of slugs).

Given the question is about mollusks with two shells, the correct class is Bivalves.

Answer:

B. Bivalves