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Science - chapter 10, sections 1-2

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mollusk
an invertebrate with a soft unsegmented body; most are protected by a hard outer shell
open circulatory system
a circulatory system in which the heart pumps blood into open spaces in the body, and blood is not confined to blood vessels
gill
an organ that removes oxygen from water
gastropod
a mollusk with a single shell or no shell
herbivore
a consumer that eats only plants
carnivore
a consumer that eats only animals
rodula
a flexible ribbon of tiny teeth in mollusks
bivalve
a mollusk that has two shells held together by hinges and strong muscles
omnivore
a consumer that eats both plants and animals
cephalapod
an ocean dwelling mollusk whose foot is adapted as tentacles that surround its mouth
arthropod
an invertebrate that has an external skeleton, a segmented body, and jointed appendages
exoskeleton
a waxy, waterproof outer shell or outer skeleton that protects the animal and helps prevent evaporation of water
molting
the process of shedding an outgrown exoskeleton
antenna
an appendage on the head of an arthropod that contains sense organs
crustacean
an arthropod that has two or three body sections, five or more pairs of legs, and two pairs of antennae
metamorphosis
a process in which an animal's body undergoes dramatic changes in form during its life cycle
arachnid
an arthropod with two body sections, four pairs of legs, adn no antennae
abdomen
the hind sections of an arthropod's body that contains its reproductive organs and part of its digestive tract.