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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 animal’s 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 arthropod’s
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 arthropod’s 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
Endoskeleton
An internal skeleton
Water Vascular
System
A system of fluid filled tubes in an
echinoderm’s body
Tube Feet
Part of an echinoderm’s water
vascular system that stick out from the
body and provides movement