7. biosphere: consists of the parts of the atmosphere, hydrosphere, and the
geosphere where life is found
8. one-way flow of high-quality energy: first factor that sustain earth's life. The sun
helps plants and other organisms feed themselves and dispersed as low-qualityenergy
to all life
9. cycling of nutrients: second factor that sustains earth's life. nutrients must be
continually recycled to support life
10. gravity: third factor that sustains earth's life. keeping all animals and things on
earth "grounded".
11. natural greenhouse effect: this natural occurrence helps warms the lower
atmosphere and the earth's surface.
12. ecology: the science that focuses on how organisms interact with one another
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