Examlex
Part of the gill structure in jawless fish evolved into jaws.
Linear
Describing a structure, progression, or relationship that follows a straight line or in simpler terms, one that proceeds from one stage to the next in a single series of steps.
Ammonia Molecule
A compound made of nitrogen and hydrogen with the formula NH3, characterized by a sharp smell and often used in fertilizers.
Trigonal Pyramidal
A molecule shape where a central atom is surrounded by three atoms at the corners of a pyramid, which has a triangular base.
Central Atom
The atom in a molecule or polyatomic ion that is surrounded by other atoms, forming the basis of the molecule's geometry.
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