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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


an organ that removes oxygen from water


a mollusk with a single shell or no shell


a consumer that eats only plants


a consumer that eats only animals


a flexible ribbon of tiny teeth in mollusks


a mollusk that has two shells held together by hinges and strong muscles


a consumer that eats both plants and animals


an ocean dwelling mollusk whose foot is adapted as tentacles that surround its mouth


an invertebrate that has an external skeleton, a segmented body, and jointed appendages


a waxy, waterproof outer shell or outer skeleton that protects the animal and helps prevent evaporation of water


the process of shedding an outgrown exoskeleton


an appendage on the head of an arthropod that contains sense organs


an arthropod that has two or three body sections, five or more pairs of legs, and two pairs of antennae


a process in which an animal's body undergoes dramatic changes in form during its life cycle


an arthropod with two body sections, four pairs of legs, adn no antennae


the hind sections of an arthropod's body that contains its reproductive organs and part of its digestive tract.

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