Chapter 2, Lesson 2. Mollusks and Annelid Worms. Objectives of the lesson. Explain how mollusks eat, control body functions, and circulate blood. Describe the four body parts that most mollusks have in common. Describe the three kinds of annelid worms. Mollusks.
Classes of mollusks
A ribbon-like organ: a tongue covered with curved teeth
In octopuses and squids
In snails and slugs
In clams and oysters
They use tentacles to grab food and place it in their powerful jaws.
They use radula to scrape algae from rocks, chunks of tissue from seaweeds, or pieces of leaves from plants.
They attach to one place and use gills to filter tiny plants, bacteria and other particles from water.