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This idea is Sewall Wright's adaptive landscape. Males may compete over an existing territory, available females, nesting sites, or breeding rights in a social hierarchy. Which pathway succeeds is determined by the competing action of these early gene products and by the influence of host factors. So when people genuinely smile, in a true burst of positive emotion, not only to the corners of the mouth, controlled by the zygomaticus major, but this muscle around the eye also contracts.

Pages: 0

Publisher: Leckie & Leckie (September 17, 2008)

ISBN: 1843726475

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