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ch 4
| Question | Answer |
|---|---|
| homeostasis | The condition in which an organisms internal environment is kept stable in spite of changes in the external environment. |
| adaption | An inherited behavior or physical characteristics that helps an organism survive and reproduce in its environment. |
| vertebrate | An animal with a backbone. |
| inverdebrate | An animal without a backbone. |
| tissue | A group of similar cells that performs a specific function. |
| organ | A body structure that is composed of different kinds of tissues that work together. |
| radial symmerty | 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 symmerty | 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 invertebrate that uses stinging cells to capture 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 radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid-filled tubes. |
| endoskelton | 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 chordates back just below the nerve cord. |
| vertabrae | 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. |
| fish | A vertebrate whose body temperature is determined by the temperature of its environment, and that lives in the water and has fins. |
| cartilage | A connective tissue that is more flexible than bone and that protects the ends of bones and keeps them from rubbing together |
| amphibian | A vertebrate whose body temperature is determined by the temperature of its environment, and that lives its early life in water and its adult life on land. |
| reptile | A vertebrate whose temperature is determined by the temperature of its environment that has lungs and scaly skin, and that lays eggs on land. |
| bird | A vertebrate whose body temperature is regulated by its internal heat, lays eggs and has feathers and a four-chambered heart. |
| mammal | A vertebrate whose body temperature is regulated by its internal heat, and has skin covered with hair or fur and glands that produce milk to feed its young. |
| mammary gland | An organ in female mammals that produce milk for the mammals young. |
| monotreme | A mammal that lays eggs. |
| marsupial | An mammal whose young are born at an early stage of development, and which usually continue to develop in a pouch on their mothers body. |
| placental mammal | A mammal that develops inside its mothers body until its body systems can function independently. |
| placenta | An organ in most pregnant mammals, including humans, that links the mother and the developing embryo and allows for the passage of materials between them. |
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skovalchik002