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| hallow balls of cells formed when the zygote undergoes cell divisions |
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| the outermost layer of cells that develop into the nervous system and sense organs |
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| the innermost layer of cells in the animal embryo and develop into the the lining of the digestive tract, respiratory system, bladder, and digestive organs. |
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| the middle layer of cells in an embryo that develops into muscles, the circulatory system, reproductive organs, and excretory organs. |
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| term used to describe an animal's shape, symmetry, and internal organization |
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| a the body plan in which the parts of the body are organized in a circle around a central axis |
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| two halves of the body mirror each other |
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| the concentration of nerve tissues and sensory organs at the anterior (front) end of the body |
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| a body cavity that contains internal organs |
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| an animal that lacks a coelom |
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| group of invertebrates with a three-layered body that has a fluid-filled cavity (pseudocelom) between the endoderm and the mesoderm |
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| an animal that has a coelom |
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| a diagram showing how animals are related through evolution |
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| a digestive cavity with only one opening |
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| the uptake of oxygen and the release of carbon dioxide |
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| thick projections of tissue that are rich in blood cells |
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| system in which the circulatory fluids are not contained in vessels |
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| closed circulatory system |
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