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Definition
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Definition
| body parts that repeat around the center of the body |
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Definition
| a single imaginary plane divides the body into two equal halves |
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Definition
| the concentration of sense organs and nerve cells at the front end of the body |
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Definition
| specialized cells that use flagella to move water through a sponge |
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Definition
| the large hole at the top of the sponge where water exits the sponge |
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Definition
| a spike-shaped structure that acts as a skeleton for a sponge |
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Definition
| produce spicules in a sponge; move around within the walls of the sponge |
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Definition
| an organism that must obtain its energy from the food that it consumes |
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Definition
| an immature form of an organism |
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Definition
| specialized stinging cells |
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Definition
| a poison-filled, stinging structure that contains a tightly coiled dart |
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Definition
| a cnidarian with the form of a cylindrical body with armlike tentacles |
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Definition
| motile, bell-shaped body with the mouth on the bottom |
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Definition
| a digestive cavity with one opening |
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Definition
| a loosely organized network of nerve cells |
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Definition
| a layer of circular muscles and longitudinal muscles that together with water in the gastrovascular cavity enable the cnidarian to move |
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| without a coelom (a body cavity) |
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Definition
| a fluid filled body cavity lined with tissue from the mesoderm |
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Definition
| a muscular tubelike mouth |
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Definition
| specialized cells that remove excess water from the body |
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Definition
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Definition
| group of cells that can detect changes in the amount of light in the environment |
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Definition
| an individual that has both male and female reproductive organs |
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Definition
| a organism splits in two parts and each half grows new parts to become a complete organism |
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Definition
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| segments of a tapeworm's body |
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| posterior opening of the digestive tract |
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