• Development includes cleavage, blastula formation, gastrulation, and organogenesis. The germ layers include ectoderm, endoderm, and mesoderm.

• Ectoderm forms, among other things, the outer layer of skin; endoderm forms many internal organs; and mesoderm forms the skeleton and muscles.

• Acoelomates are animals without a body cavity. Pseudocoelomates are animals whose body cavity is not completely lined by mesoderm. Coelomates have a body cavity completely lined by mesoderm.

• Protostomes have spiral cleavage and schizocoely. Deuterostomes have radial cleavage and enterocoely.

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