+A **chemical signal** is a [Molecule](/wiki/molecule) conveying [Information](/wiki/information), enabling communication within and between organisms. These silent messengers orchestrate fundamental biological processes like growth, reproduction, and defense across all life.
+## See also
+- [Hormone](/wiki/hormone)
+- [Neurotransmitter](/wiki/neurotransmitter)
+- [Pheromone](/wiki/pheromone)
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