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Definition
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Definition
| the outer layer of tissue |
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Definition
| the joining of an egg and a sperm cell |
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Definition
| the first step of development when a cell divides into two cells that still take up the same amount of space |
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Definition
| the middle layer of tissue |
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Definition
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Definition
| the place where a blastula enfolds into a deep cavity |
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Definition
| the inner layer of tissue |
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Definition
| series of cell division that occurs immediately following fertilization |
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Definition
| cleavage occurs in a spiral arrangement, "first mouth" |
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Term
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Definition
| when the cells divide in a spiral arrangement |
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Term
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Definition
| organisms that develop the mouth end of the gut second |
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Term
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Definition
| cell divisions are parallel to or at right angles to the axis form one pole of the blastula to the other |
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Definition
| a false cavity or one filled with fluid |
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Definition
| a cavity completely lined by the mesoderm. |
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Term
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Definition
| cleavage in which each cell can become a separate organism |
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Term
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Definition
The process that transforms the bastula into
a multilayered embryo |
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Definition
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