The biosphere is the portion of Earth that is inhabited by life.

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Presentation transcript:

KEY CONCEPT The biosphere is one of Earth’s four interconnected systems.

The biosphere is the portion of Earth that is inhabited by life. The biosphere includes all ecosystems. one of Earth’s systems includes the biota, all the living things in the biosphere

There are three other Earth systems. hydrosphere—water, ice, and water vapor atmosphere—air blanketing Earth’s solid and liquid surface geosphere—geologic features above and below Earth’s surface

Biotic and abiotic factors interact in the biosphere. All four Earth systems are interconnected. The Gaia hypothesis considers Earth as a kind of living organism. Earth systems interact to yield a biosphere capable of supporting life. It was developed by James Lovelock and Lynn Margulis.