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Definition
| Symmetry along one particular plane through a central axis. |
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| The asexual reproductive process in which the adult produces miniature versions of iself that drop off and assume an independent existence. |
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Definition
| The concentration of sensory organs and a brain in a defined head region. |
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| closed circulatory system |
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Definition
| A type of circulatory system that distributes gases and nutrients throughout the body thrugh the heart and blood vessels. |
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Definition
| A fluid-filled cavity that is completely lined wtih a thin layer of tissue that develops from mesoderm. |
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Definition
| An eye with multiple light detectors |
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Definition
| The method of development in which the body cavity forms as an outgrowth of the digestive cavity. |
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Definition
| The germ layer which covers the body and lines its inner cavities and nerve tissues. |
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Definition
| The germ layer which lines most hollow organs. |
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Definition
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Definition
| An external skeleton that encloses the body like a suit armor |
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Definition
| clusters of nerve cells forming a simple brain. |
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Definition
| thin, external respiratory membranes |
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Definition
| A blood cavity present in mollusks which bathes the organs in blood. |
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Definition
| possessing both male and femal sexual organisms. |
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Definition
| A rigid framework against which muscles can act. |
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Definition
| Animals lacking a backbone. |
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Definition
| The immature stage of an insect. |
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Definition
| The third germ layer between the endoderm and ectoderm which forms muscle and the skeletal and circulatory systems. |
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Definition
| a radical change from a juvenile body form to an adult body form. |
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Definition
| The process of shedding an unfit exoskeleton. |
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Definition
| Paired nerual structures which conduct nervous signals to and from the ganglia. |
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Definition
| A circulatory system in which blood simply bathes the organs. |
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Definition
| Organisms that live in or on the body of another organism. |
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Term
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Definition
| The develop method in which the body cavity forms withing hte space between the body wall and hte digestive cavity. |
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Term
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Definition
| A body cavity that is not completely surrounded by mesoderm-derived tissue. |
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Definition
| A nonfeeding stage of insect life in which the insect metamorphoses into its adult form. |
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Definition
| Symmetry in which any plane through a central axis dividees the object into rough halves. |
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Definition
| A feature in which the body is devided into a series of repeating segments, advantageous for lovomotion. |
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Definition
| Groups of similar cells integrated into a functional unit. |
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