A stage of embryonic development, seen in all animals except the sponges. It follows the blastula phase. The gastrula phase is marked by a dramatic restructuring called gastrulation. After gastrulation is complete, the embryo develops into a neurula[?].
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... counterparts. Also, there exists a third, extra-long length for most vowels, which is used in various cases, but particularly when recording a shout, or a ...