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| body plan in which a single imaginary line can divide the body into left and right sides that are mirror images of each other |
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| hollow ball of cells that develops when a zygote undergoes a series of cell divisions |
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| concentration of sense organs and nerve cells at the anterior end of an animal |
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| animal that has, for at least one stage of its life, a dorsal, hollow nerve cord, a notochord, a tail that extends beyond the anus, and pharyngeal pouches |
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| body cavity lined with mesoderm |
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| group of animals in which the blastopore becomes an anus and the mouth is formed from the second opening that develops |
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| outermost germ layer; produces sense organs, nerves, and outer layer of skin |
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| innermost germ layer; develops into the linings of the digestive tract and much of the respiratory system |
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| process in which a stimulus produces a response that opposes the original stimulus; also call negative feedback |
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| animal that lacks a backbone, or vertebral column |
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| middle germ layer; develops into muscles, and much of the circulatory, reproductive, and excretory systems |
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| long supporting rod that runs through a chordate’s body just below the nerve cord |
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| one of a pair of structures in the throat region of a chordate |
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| an animal whose mouth is formed from the blastopore |
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| body cavity that is only partially lined with mesoderm |
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| body plan in which any number of imaginary planes drawn through the center of the body could divide it into equal halves |
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| animal that has a backbone |
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