Goal four is to comprehend how past life on earth acted
upon the changing planetary solar system environment. Also, by incorporating
evidence from both geological and bimolecular records of ancient life and its
environments, we can investigate the historical relationship between earth and
its biota. Another thing we must understand is how the planetary environment
has influenced the evolution of life. In addition to that we must figure out
how biological processes changed that environment. All of this information will
improve our ability to detect remaining biosignatures, even in places where
life have been gone for years. The complete understanding of this needs a
mixture that comes from many different fields of science. Also important to
finding if there is life in space biogeochemical cycles of carbon and its
partner’s oxygen, sulfur, and iron are very important to earth's biosphere, and
their isotopic records help us become aware of how the biosphere evolved. With
these answers and mechanical framework astrobiologists can begin to study and
analyze the following questions:
1. What chemical and physical environment was like when the earliest life
(microbes) covered the earth?
2. Was this environment similar to the early environment on Mars?
3. How, why, and when did the composition of out biosphere change through time?
4. How did life respond to these changes, other planetary disturbances?
5. Where some of these disturbances caused by life itself?
6. How had the planetary environment influenced the evolution of complex,
multi-cellular, and eukaryotic life?
7. What environmental changes were associated with the appearance of
intelligent life?
All of this research can result directly to the identification of
biosignatures.
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