1. the part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life
2. the living beings of the earth or a particular region considered as an ecological unit

Examples

• The biosphere extends from the ocean depths to several miles above the earth’s surface.
• Human activities are having a significant impact on the biosphere.
• Scientists study how pollution affects the biosphere.
• The biosphere includes all plants, animals, and microorganisms on Earth.
• Climate change threatens the delicate balance of the biosphere.
• Marine biologists focus on the ocean’s portion of the biosphere.
• The biosphere reserve protects endangered species and their habitats.