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Definition
| keeping internal body conditions the same |
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| structures and behaviors that allow animals to perform their functions |
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| animals without a backbone |
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| group of similar cells that perform specific functions |
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Definition
| a body structure that is composed of different types of tissue that work together |
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Definition
| when many lines can be drawn through a central point to divide an object into mirror images |
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| when only one line of symmetry can be drawn through an object |
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| invertebrates that have stinging cells and take food into a central body cavity |
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| invertebrates with soft, unsegmented bodies that are often protected by a hard shell |
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Definition
| invertebrates that have hard outer coverings, segmented bodies, and pairs of jointed appendages |
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| an invertebrate that has an internal skeleton and a system of fluid-filled tubes |
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| an animal that has a notochord, a nerve cord, and pouches in the throat area at some point in its life |
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| a flexible rod that supports a chordate's back |
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| a stack of many small bones that make up the backbone |
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| an animal that produces little internal body heat |
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| an animal that controls the internal heat it produces and regulates its own temperature |
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| a vertebrate that lives in water and uses fins to move |
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Definition
| a tissue more flexible than bone |
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Definition
| a vertebrate that is ectothermic and spends its early life in water and its adult life on land |
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Definition
| an ectothermic vertebrate that has scaly skin and lungs and lays eggs on land |
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| an endothermic vertebrate that lays eggs and has feathers and a four-chambered heart |
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| endothermic vertebrates that have skin covered with fur or hair, and a four-chambered heart |
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| mammals that are born at an early stage of development, and usually continue to develop in a pouch on the mother's body |
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| a mammal that develops inside its mother's body until its own body systems can function independently |
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Definition
| an organ that exchanges materials between the mother and the embryo |
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