3
What do Cephalopods eat?
Sharks eat cephalopods
Cephalopods are the only mollusks with a closed circulatory system. They have two gill hearts (also known as branchial hearts) that move blood through the capillaries of the gills. A single systemic heart then pumps the oxygenated blood through the rest of the body. Like most molluscs, cephalopods use hemocyanin, rather than hemoglobin to transport oxygen
Cephalopods use their tentacles mainly to catch food.
Nope. They are reptiles. Cephalopods are octopuses and squids and cuttlefish. Reptiles and cephalopods are not very closely related at all; cephalopods are protostomes and cephalopods are deuterostomes, and the protostome/deuterostome split occurred very early in the history of animalia.
no
No
Three! Get off here and stop thinking about birds butts
Yes, some animals have two hearts. For example, cephalopods like squids and octopuses have a main systemic heart that pumps oxygenated blood through the body, and a branchial heart that pumps deoxygenated blood to the gills to be oxygenated.
Octopus, cuttlefish and squid are all cephalopods. http://en.wikipedia.org/wiki/Cephalopod
No. Squids and octopi are a class of mollusks called Cephalopods, and as with all mollusks, cephalopods are invertebrates.
Bivalves, univalves, and cephalopods are all types of mollusks. So are gastropods.