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A. Mollusks - soft bodied invertebrates that have a
mantle and a muscular foot.
1. Mantle - tissue that covers a mollusk’s body.
2. Have lungs or gills that exchange carbon dioxide
for oxygen.
3. Have a radula or a scratchy tongue-like organ to
help them eat.
Three Groups of Mollusks
1. Gastropods - most have a shell and are the largest
a. Live in water or land
b. Move by gliding their large muscular foot
across a trail of mucus.
c. Have a radula to help them get food.
d. Snails, slugs, and conchs are examples.
2. Bivalves - have two shell halves held together by
a muscle.
a. Are filter feeders that take food out of the water.
b. Have gills that take oxygen out of the water.
c. Have an open circulatory system where blood
splashes over organs.
d. Clams, oysters, and scallops are examples.
3. Cephlapods - have no shell and are the most
complex group.
a. Developed foot is divided into tentacles with suckers.
b. Have a closed circulatory system that contains
blood vessels.
c. Adapted for quick movement in the ocean.
d. Octopuses, squids, and nautilus are examples.