PSYC14H3 Chapter Notes -Laetoli, Lactose Intolerance, Melanin
Document Summary
Bipedalism cooled the body by reducing the amt of direct sunlight that struck the body and by exposing upper body to the wind. Wearing shoes changes the shape of the foot. Laetoli footprints are wider with a larger gap btwn first two toes and a higher arch (they didn"t wear shoes) Humans that wore shoes show footprints that have their first two toes closer tgt and a lower arch. Wearing shoes can also change the way we run. Ppl running barefeet land on fore-feet or mid-feet. Ppl running with shoes land on rear-feet. Anecdotal reports show that running barefoot leads to reduced injury rates. Culture experiences not only shape the way we think, but also affect our bodies and health. Biological variability of humans (innate and acquired biological differences) Humans continue to evolve everyday in response to selection pressures from their environment.
