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for science grade 6 ...a Prentice hall book...


invertebrate having a soft unsegmented body usually enclosed in a 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 at all.


any animal that eats plants only.


an animal that eats other animals


a flexible ribbon of tiny teeth in mollusks


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


an animal 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.


an inner shell


the process of shedding an outgrown exoskeleton


one of a pair of mobile appendages on the head that contain 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 animals body undergoes dramatic changes in form during its life cycle.


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


the hind section of an arthropods body that contains its reproductive organs and part of its digestive tract.


an arthropod with three body sections,six pairs of legs,and usually one or two pairs of wings.


an insects midsection to which its wings and legs are attached.

complete metamorphosis

a type of metamorphosis characterized by four dramatically different stages.


the third stage of complete metamorphosis in which an insect changes from a larva to an adult.

gradual metamorphosis

a type of metamorphosis in which an egg hatches into a nymph that resembles an adult and which has no distinct stage.


a stage of gradual metamorphosis that usually resembles the adult insect

food chain

a series of events in which one organism eats another and obtains energy


the study of how organisms interact with their environments.


an organism that make its own food.


an organism that obtains energy by feeding on other organisms.

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