Gastrulation is the process during which the early sphere-like embryo of most animals is dramatically re-organised by the inward migration of cells on the outside of the embryo. During gastrulation, ...
As a member of the Phylum, Cnidaria, hydra arose early during metazoan evolution before divergence of the protosome and deuterostome branches. Its body plan is organized as a gastric tube with a mouth ...
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