Describe two theories for why bipedalism evolved?

Two prominent theories for the evolution of bipedalism are the "Savanna Hypothesis" and the "Thermoregulatory Hypothesis." The Savanna Hypothesis suggests that as early hominins adapted to open grassland environments, bipedalism allowed them to travel longer distances to find food and resources while maintaining a higher vantage point to spot predators. The Thermoregulatory Hypothesis posits that standing upright reduces the surface area exposed to the sun, helping early humans to regulate body temperature more efficiently in hot environments, thus enhancing their endurance and survival.