1) Male and female -> urine and BO pheromones attracting each other.
2) Sperm surrounding an egg - > production of a child with more X than Y chromosomes Xq28 / Double helix.
3) Production of the child -> environmental change and child growth to man.
4) BO pheromones re-introduced.
5) Pheromones through nasal cavity.
6) Brain reaction to pheromones - Hypothalamus.
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