chapter 2 science ''animals'' grade 6

Created by haha1999 

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28 terms · for science grade 6 ...a Prentice hall book...

mollusk

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.

gill

an organ that removes oxygen from water

gastropod

a mollusk with a single shell or no shell at all.

herbivore

any animal that eats plants only.

carnivore

an animal that eats other 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

an animal that eats both plants and animals

cephalopod

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

an inner shell

molting

the process of shedding an outgrown exoskeleton

antenna

one of a pair of mobile appendages on the head that contain 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 pairs of legs, and no antennae

abdomen

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

insect

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

thorax

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

complete metamorphosis

a type of metamorphosis characterized by four dramatically different stages.

pupa

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.

nymph

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

ecology

the study of how organisms interact with their environments.

producer

an organism that make its own food.

consumer

an organism that obtains energy by feeding on other organisms.

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