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28 terms

chapter 2 science ''animals'' grade 6

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