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7th Chap 2 Mollusk

mollusk An invertebrate with a soft, unsegmented body; most are protected by a hard outer 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.
herbivore An animal that eats only plants.
carnivore An animal that eats only 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.
Name 5 characteristics of all mollusks. 1. invertebrate 2. Soft, unsegmented body 3. Often have a outer shell 4. Have a mantle 5. Have a foot
What are the three types of mollusks? 1. Gastropods 2. Bivalves 3. Cephalopods
arthropod An invertebrate that has an external skeleton, a segmented body, and joined appendages.
exoskeleton A waxy, waterproof outer shell or outer skeleton that protects the animal and helps prevent evaporation of water.
molting The process of shedding an outgrown exoskeleton.
antenna An appendage on the head of an animal 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 pairs of legs, and no antenna.
abdomen The hind section of an arthropods body that contains its reproductive organs and part of its digestive tract.
What are the four major groups of arthropods? 1. Arachnids 2. Centipedes/Millipedes 3. Crustaceans 4. Insects
What are the 4 main characteristics that all arthropods have? 1. invertebrates 2. External skeleton 3. Segmented body 4. Jointed appendages
insect An arthropod with three body sections, six legs, one pair of antennae, and usually one or two pairs of wings.
thorax An insect's 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 has not distinct larval stage.
nymph A stage of gradual metamorphosis that usually resembles the adult insect.
Created by: jamimurray