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| process of head development in bilaterally symmetrical animals |
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| animals that lack a backbone |
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| the hind end of a bilaterally symmetrical animal usually found near the end of the digestive tract |
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| the front end of a bilaterally symmetric animal |
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| the bottom or chest of a bilaterally symmetrical animal |
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| the orderly structure of living things where cells are arranged into tissues, organs, and organ systems |
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| middle layer of embryonic tissue in animals that develops into the skeleton and muscles |
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| an animal whose body temperature is determined by the temperature of the enivroment and must asborb heat from the surrounding air |
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| an animal that generates its own body heat and must maintain a stable internal temperature |
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| the back or upper surface of a bilaterally symmetrical animal |
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| in animals it is the outer layer of embryonic tissue from which the skin and nervous system develops |
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| the inner layer of embryonic cells which develops into the lining of the digestive and respiratory systems |
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| microscopic plant and animal organisms the drift freely in the upper waters of the ocean |
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| an organism that is made up of two or more cells |
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| arrangement of body parts around a point or central axis |
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| radial, bilateral, and asymmetrical are 3 types of what? |
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| reproduction that does not involve a union of gametes |
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| one parental cell divides to produce two daughter cells |
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