I WONDER - Do All Mollusks Have Shells?

The video tutorial explains the characteristics of snails and other mollusks, focusing on their mantles and shells. It describes bivalves like oysters and clams, highlighting their ability to open and close. The tutorial also covers the mobility of mollusks, detailing how they move using a foot and muscles. Finally, it discusses how mollusks without mantles, such as octopi and squids, use a funnel for jet propulsion.

What is the primary difference between the mantles of snails and bivalves?

• Both snails and bivalves have the same type of mantle.

• Bivalves have a single mantle, while snails have two.

• Snails have a single mantle, while bivalves have two.

• Snails have two mantles, while bivalves have one.

Which of the following mollusks have bivalves?

• Octopi and clams

• Squids and snails

• Snails and octopi

• Clams and oysters

How do most mollusks with shells move?

• By rolling

• By using a foot to expand and contract muscles

• By swimming

• By flying

What feature allows octopi and squids to move?

• A funnel

• A shell

• A bivalve

• A foot

What is the function of the funnel in octopi and squids?

• To act as a jet propellant

• To store food

• To protect their soft skin

• To help them breathe