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Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
Variation means an instance of change or the rate or magnitude of change. It may refer to
- Biodiversity
- Genetic variation, differences within a species
- Variation (genetics) , mutations resulting from chromosomal alteration