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Lessons 3 and 4

Cnidarian A radially symmetrical invertebrate that uses stinging cells to capture food and defend itself.
Mollusk An invertebrate with a soft, unsegmented body; most are protected by a hard outer shell.
Arthropod An invertebrate that has an external skeleton, a segmented body, and jointed appendages.
Exoskeleton External skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates.
endoskeleton An internal body skeleton; structural support system within the body of an animal.
Echinoderm A radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid-filled tubes.
Chordate An animal that has a notochord, a nerve cord, and throat pouches at some point in its life.
Notochord A flexible rod that supports a chordate's back just below the nerve chord.
Vertebra The bones that make up the backbone of an organism
Ectotherm An animal whose body temperature is determined by the temperature of its environment.
Endotherm An animal whose body temperature is regulated by the internal heat the animal produces.
Created by: cwright6015



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