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What are the factors that help to explain the slow political unification of Italy and Germany, but not England or France, in the Middle Ages?
Pseudocoelom
A body cavity between the mesoderm and endoderm; derived from the blastocoel. Compare with coelom.
Echinoderms
Phylum of spiny-skinned marine deuterostome invertebrates characterized by a water vascular system and tube feet; include sea stars, sea urchins, and sea cucumbers.
Segmentation
A body plan in which the body is divided into a series of compartments (segments).
Deuterostomia
Deuterostomia is a major division of the animal kingdom that includes groups like the chordates and echinoderms, characterized by the developmental feature in which the anus forms from the first opening in the embryo, with the mouth forming later.
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