An embryonic stage in certain animals where a hollow cavity has formed during early development.
From Greek 'koilos' (hollow) + 'gaster' (belly) + '-ula' (diminutive suffix). The term describes an early stage of animal development with a hollow center.
In the first days of a baby animal's development, its cells rearrange to create a hollow ball—and this simple shape becomes the foundation for all complex animal bodies.
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