The correct answer is atmosphere, water cycle, and climate
The Sun is the main source of energy on the earth. The heat that reaches the earth is in adequate amount so that life could be possible on earth.
The atmosphere on the earth has optimum amount of mixture of gases, water vapor and other constituents that supports life.
Water is the most important component of all living beings on earth and hence water cycle is very important for the pressence of life on earth. Sun regulates the water cycle.
Climate on the earth is also regulated by the time of exposure of sunlight on the earth.
