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Unformatted text preview: opposite halves. Bilaterian (bi-luh-ter-e-uhn) Member of a clade of animals with bilateral symmetry and three germ layers. Blastopore (blas-to-por) In a gastrula, the opening of the archenteronthat typically develops into the anus in deuterostomes and the mouth in protostomes. Blastula (blas-tyu-luh) A hollow ball of cells that marks the end of the cleavage stage during early embryonic...
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- Spring '10