What is the reason for four limbs?

Four limbs provide a balanced and versatile structure for locomotion, manipulation, and interaction with the environment. This configuration allows for efficient movement in various terrains, as seen in quadrupedal animals, while also enabling complex tasks such as grasping and tool use in primates. Additionally, having four limbs allows for greater stability and support, which is crucial for survival and adaptation in diverse habitats. Overall, the evolutionary development of four limbs has contributed significantly to the adaptability and success of many species.