The document discusses how an individual's environment, including prenatal, neonatal, circadian, social, and urban/rural environments, can impact their development and physiology. Prenatal stress can determine the number of stress receptors in the brain and how an individual responds to stress as an adult. Neonatal nutrition and stress can also impact development. Circadian rhythms and hormones are entrained by light and dark cycles early in life. Social environments shape individuals through mechanisms like social regulation of reproduction in some fish species. The environments we create can subtly alter our evolution over time through these developmental and physiological impacts.