Gessella
- Gessella is a fossil genus of liverworts in the family Haplomitriaceae. All known fossils come from Early Permian deposits of Western Sealand.
Gesell’s Maturational Theory
- The Maturational Theory of child development was introduced in 1925 by Dr. Arnold Gesell, an American educator, pediatrician and clinical psychologist whose studies focused on "the course, t
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