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Which five ecosystems were created inside Biosphere 2?

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The main aboveground structure of Biosphere 2 contains five distinct ecosystems designed to emulate Earth's environment:1

  • Coastal fog desert
  • Tropical rainforest
  • Savanna grassland
  • Mangrove wetland
  • Ocean (which includes a coral reef)

These ecosystems were housed within the facility's primary glass-enclosed area to study the viability of self-sustaining colonies for potential use in outer space.1