Questions: 9. A squid is an example of a A. cephalopod C. gastropod B. bivalve D. trivalve 10. Mytilis edulis is an example of what type of bivalve? A. oyster C. clam B. mussel D. snail

9. The answer is A: cephalopod.
   Explanation:

• A. Cephalopod: Squids belong to the class Cephalopoda, which also includes octopuses and cuttlefish.
• B. Bivalve: Bivalves are mollusks with two shells, such as clams and oysters, which do not include squids.
• C. Gastropod: Gastropods include snails and slugs, not squids.
• D. Trivalve: This is not a recognized category in mollusks.

10. The answer is B: mussel.
    Explanation:

• A. Oyster: Mytilis edulis is not an oyster; oysters belong to a different family.
• B. Mussel: Mytilis edulis is commonly known as the blue mussel, which is a type of bivalve.
• C. Clam: Clams are a different type of bivalve, not Mytilis edulis.
• D. Snail: Snails are gastropods, not bivalves.

In summary, a squid is a cephalopod, and Mytilis edulis is a type of mussel.