Phylum Mollusca Review

4. The hard shell-like structure that lies along the backside of the squid and supports the body is called this.
8. Ocean acidification causes a decrease on this scale, which is how acidity is measured.
12. Mollusks were the first animals to develop respiratory organs, including lungs for breathing on land and these for breathing under water.
13. Spots in the skin of cephalopods that allow them to change color rapidly in order to camouflage or to communicate.
14. A scientist who studies mollusks.
15. Gastropods have at least 4 of these on their head. Two have eyes at the ends, and the other 2 are used for feeling/smelling/tasting.
18. All mollusks (except snails) have this type of body symmetry.
21. Cephalopods have this structure in their mouth used to tear into prey.
22. Mollusks have 3 embryonic germ layers, which is called this.
23. These muscles are used by bivalves to open and close their shells.
24. A tube that moves water into or out of the body. Bivalves have 2, Cephalopods have 1.
26. This helps the squid change direction when swimming.
27. All mollusks perform this type of reproduction, which can be internal or external.
28. A flexible, tongue-like structure with abrasive teeth that point backward that mollusks use to cut or scrape food from a surface.
29. Cephalopods have this many hearts, which contributes to their fast speed.
30. A large muscular organ used for locomotion. Some are split into tentacles.

1. Gastropods are monoecious and have a combined ovary and teste called this.
2. Humans have hemoglobin in their blood which makes it red. Gastropods and Cephalopods have this in their blood which makes it blue.
3. This class of mollusks includes animals with 8 or more tentacles.
5. Carbon dioxide mixes with water to form this acid, which weakens shells.
6. The 3 main parts of a mollusk’s body includes the head, foot, and this mass.
7. This organ secretes the calcium carbonate shell of mollusks.
9. Bivalves are these types of feeders. They sift microscopic food out of the water using their gills/palps.
10. Cephalopods have this type of circulatory system, similar to humans.
11. This class of mollusks include aquatic and terrestrial snails and slugs.
16. The pore leading to a lung that terrestrial Gastropods use to breathe.
17. Ocean acidification decreases the availability of this molecule/ion, which mollusks use to build their shells.
19. Cephalopods can squirt this into the water to scare or confuse predators and give them time to swim away.
20. This phenomenon is occurring in the ocean due to humans burning fossil fuels (gas, coal, oil) for energy.
25. This class of mollusks have two shells and no brain.