A biosphere is a sphere of life …………… a closed system of living things that is completely self-sufficient and cut off from any other system. So far as is ___1___, the Earth is the only natural biosphere that exists. The Earth support a __2__ balanced, delicate network of life, and the only outside help it __3__ is the energy of the sun.
There may be other biospheres in __4__ space, and people many someday discover them. But the other planets of our solar system, at least, seem barren and __5__ . If people are to __6__ these planets and perhaps one day colonize them …. They will have to create their own biospheres just as __7__ and just as self-sustaining as Earth’s system. Can this be done?
To find out, a group of researchers has begun an extraordinary __8__ the creation of a separate, enclosed biosphere in the middle of the Arizona desert, near Tucson. Called biospheres II, this huge glass structure will have its own __9__ of air, water, and nutrients. It will be stocked __10__ a mixture of plants and animals that, the researchers hope, can live together in perfect __11__. And in late 1990, after the structure has been completed, eight is closed, onry sunlight will enter the structure.
A biosphere is a sphere of life …………… a closed system of living things that is completely self-sufficient and cut off from any other system. So far as is ___1___, the Earth is the only natural biosphere that exists. The Earth support a __2__ balanced, delicate network of life, and the only outside help it __3__ is the energy of the sun.
There may be other biospheres in __4__ space, and people many someday discover them. But the other planets of our solar system, at least, seem barren and __5__ . If people are to __6__ these planets and perhaps one day colonize them …. They will have to create their own biospheres just as __7__ and just as self-sustaining as Earth’s system. Can this be done?
To find out, a group of researchers has begun an extraordinary __8__ the creation of a separate, enclosed biosphere in the middle of the Arizona desert, near Tucson. Called biospheres II, this huge glass structure will have its own __9__ of air, water, and nutrients. It will be stocked __10__ a mixture of plants and animals that, the researchers hope, can live together in perfect __11__. And in late 1990, after the structure has been completed, eight is closed, onry sunlight will enter the structure.
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