The answer is by both convection and radiation. Direct sunlight penetrates to the surface, heating air particles and the ground and water. As these particles/molecules heat up, the heat spreads around AND rises. What does this have to do with the biosphere, you ask? Organisms are directly warmed by sunlight, and each other (consumers) to stay warm as well. Please give me "best answer"!
Heat in the biosphere is primarily transported through convection and radiation. Convection involves the movement of warm air or water, while radiation refers to the transfer of energy from the sun without needing a medium. Both processes are essential for maintaining the Earth's climate and supporting living organisms.
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