The part of the Earth that consists of all living things, including animals, plants, and microorganisms, is known as the "biosphere." The biosphere encompasses all the regions of the Earth where life exists, including the surface of the land, bodies of water such as oceans, lakes, and rivers, and the lower part of the atmosphere. It represents the interconnected web of life, where organisms interact with each other and their environment to sustain life processes and maintain ecological balance. The biosphere is a dynamic and complex system that supports the incredible diversity of life on Earth.