In embryology, a body cavity or coelom formed from within, particularly referring to internal cavity formation.
From Greek 'entos' (within) plus 'koilos' (hollow, cavity). This embryological term describes how some organisms develop their main body cavities through internal folding.
Different animal groups form their body cavities in different ways—some fold inward (entocoel), others split from within. Understanding this helps biologists figure out which animals are actually related to each other!
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