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Animals Chapter 4
Lesson 1, 2, 3, & 4
| Question | Answer |
|---|---|
| Homeostasis | The condition in which an organism internal environment is kept stable in spite of changes in the external environment |
| Adaptation | An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment |
| Vertebrate | An animal with a backbone |
| Invertebrate | An animal without a backbone |
| Tissue | A group of similar cells that perform a specific function |
| Organ | A body structure that is composed of different kinds of tissues that work together |
| Radial Symmetry | A body plan in which any number of imaginary lines that all pass through a central point divide the animal into two mirror images |
| Bilateral Symmetry | A body plan in which a single imaginary line divides the body into left and right sides that are mirror images of each other |
| Cnidarian | A radially symmetrical invertebrates 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 |
| Echinoderm | A radically symmetrical marine invertebrate that has an internal skeleton and a system of fluid-filled tubes |
| Endoskelelton | An internal skeleton; structural support system within the body of an animal |
| 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 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 |
Created by:
FDMcCormick
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