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Animals:Lesson 3 & 4
| Question | Answer |
|---|---|
| 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. |
| Arthopod | 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. |
| Enchinoderm | 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 cord. |
| Vertebra | The bones that make up the backbone of an organism. In humans, one of the 26 bones that make up the backbone. |
| 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. |
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iphillippe
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