The biosphere is the sphere of the Earth composed of all living organisms and their interactions with each other and their environment. It encompasses all ecosystems, including terrestrial and aquatic ones, and the atmosphere. The biosphere is a complex, interconnected system that is constantly evolving and adapting to changes. It is responsible for maintaining the balance of gases in the atmosphere, regulating the climate, and providing essential resources for life. It is home to an incredibly diverse range of species, from microscopic bacteria to towering trees and everything in between. The biosphere plays a crucial role in sustaining life on Earth and is essential for the survival of all living beings.