Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| adaptation | A behavior or physical characteristic that allows an organism to survive or reproduce in its environment.
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| fertilization | The joining of an egg and sperm.
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| vertebrate | Animal with a backbone.
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| invertebrate | Animal without a backbone.
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| bilateral symmetry | Body plan with two halves that are mirror images.
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| radial symmetry | The quality of having many lines of symmetry that all pass through a central point.
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| larva | The immature form of an animal that looks very different from the adult.
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| cnidarian | An invertebrate animal that uses stinging cells to capture food and defend itself.
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| polyp | The cnidarian body plan is characterized by a vase like shape and that usually adapted for a life attached to an underwater surface.
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| medusa | The cnidarian body plan having a bowl shape and adapted for a free-swimming life.
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| parasite | The organism that benefits by living on or in a host in a parasitism interaction.
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| host | The organism that a parasite or virus lives in or on.
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| scavenger | A carnivore that feeds on the bodies of dead organisms.
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| closed circulatory system | A circulatory system in which blood moves only within a connected network of tubes called blood vessels.
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| mollusk | An invertebrate with a soft, unsegmented body; most are protected by a hard outer shell.
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| open circulatory system | Circulatory system in which the heart pumps blood into open spaces in the body, and blood is not confined to blood vessels.
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| gill | An organ that removes oxygen from water.
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| gastropod | A mollusk with a single shell or no shell.
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| cephalopod | A ocean-dwelling mollusk whose foot is adapted as tentacles that surrounds its mouth.
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| bivalve | A mollusk that has two shells held together by hinges and strong muscles.
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| herbivore | A consumer that only eats plants.
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| carnivore | A consumer that only eats meat.
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| omnivore | A consumer that eats meat and plants.
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| radula | Flexible ribbon of tiny teeth in mollusks.
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| Arthropod | An invertebrate that has an external skeleton a segmented body and joined appendages.
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| exoseleton | A waxy waterproof outer shell or outer skeleton that protects the animal and helps prevent evaporation of water.
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| molting | The process of shedding an outgrown exoskeleton.
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| crustacean | An arthropod that has two or three body sections, five or more pairs of legs, and two pairs of antennae.
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| complete metamorphosis | A type of metamorphosis characterized by four dramatically different stages.
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| gradual metamorphosis | A type of metamorphosis in which an egg hatches into a nymph that resembles an adult.
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| arachnid | An arthropod with two body sections, for pairs of legs, and no antenne.
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| insect | An arthropod with three body sections, six legs, one pair of antennae, and usually one or two pairs of wings.
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| thorax | An arthropods midsection, which its wings and legs are attached.
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| pupa | The third stage of the complete metamorphosis, in which the insect changes from a larva to an adult.
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| nymph | A stage of gradual metamorphosis that usually resembles the adult insect.
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| echinoderm | A radially symmetrical invertebrate that lives on the ocean floor and has an internal skeleton and a water vascular system.
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| endoskeleton | A system of fluid filled tubes in an echinoderms body.
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| water vascular system | An internal skeleton on an insect.
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Or sort by any of the columns using the down arrow next to any column heading.
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