Seasonal shifts refer to the changes in weather and environmental conditions that occur throughout the year. These shifts are primarily driven by the tilt of the Earth's axis and its orbit around the Sun. As the Earth moves, different regions receive varying amounts of sunlight, leading to distinct seasons such as spring, summer, autumn, and winter. During these seasonal changes, various natural phenomena occur. For example, in spring, plants begin to bloom, while in autumn, leaves change color and fall. Animals also adapt their behaviors, such as migration in birds or hibernation in some mammals, in response to these shifts in climate and resources.