Mollusk An invertebrate with a soft unsegmented body

Mollusk An invertebrate with a soft unsegmented body often protected by a hard outer shell Open Circulatory System Circulatory system in which the heart pumps blood into open spaces in the body 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 Radula 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 Cephalopod An ocean dwelling mollusk whose foot has 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 skeleton that protects an animal and prevents 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 animals body undergoes dramatic changes in form during its life cycle Arachnid An arthropod with two body sections, four pair of legs and no antennae Abdomen The hind section of an arthropods body that contains its reproductive organs and digestive tract Insect An arthropod with three body sections, six legs, one pair of

antennae and one or two pair of wings Thorax An arthropods midsection, to which its wings and legs are attached Complete Metamorphosis Type of metamorphosis characterized by four dramatically different stages Pupa The third stage of complete metamorphosis in which an insect changes from larva to adult Gradual Metamorphosis Type of metamorphosis where an egg hatches into a nymph that

resembles an adult Nymph Stage of gradual metamorphosis that usually resembles and adult insect Food Chain A series of events in which one organism eats another and obtains energy Ecology The study of how organisms interact with their environment Producer An organism that makes its own food Consumer

An organism that obtains its energy by feeding on other organisms Decomposer An organism that breaks down chemicals from wastes and dead organisms returning material to the soil and water Pollinator An animal that carries pollen from one plant to another of the same species, allowing it to reproduce Pesticide A chemical designed to kill a pest animal Biological Control A natural predator or disease used to control a pest insect

Echinoderm A radially symmetrical invertebrate that lives on the ocean floor, has an internal skeleton and a water vascular system Endoskeleto n An internal skeleton Water Vascular System A system of fluid filled tubes in an echinoderms body Tube Feet Part of an echinoderms water vascular system that stick out from the body and provides movement

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