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Competing Theories on Life's Origin - School Essays

Competing Theories on Life's Origin

Scientist have always had different views on how the origin of life started on Earth.

Some believe that our Earth began on another planet and did not start here. Scientist call this theory as arriving from an extraterrestrial source This belief is known as aliens. Hypothetically some scientists believe life started as a small bacteria then over time advanced to humans. There are a few scientists who are arguing that life originated as a virus. The testing of the scientists on this theory is known as astrobiology. Scientists who study astrobiology believe the Earth began 9.7 billion years ago. Many scientists consider the astrobiology theory highly possible, but they are still ...

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became more complex and began to start the metabolic process. Eventually the cells formed a complex heterotroph. These heterotrophs fed on the organic material that the �soup� produced. The heterotroph began to become more complex, in doing so they started to release carbon dioxide. When the carbon dioxide was released, the environment released oxygen that was lethal. As the heterotrophs matured, they became the supreme beings that are now visible on the Earth.
Many scientists today are beginning to believe that life originated as an autotroph. Simply put this is theory that says life was not much different then as it is today. Also in this theory, scientists believe that the basses of all life forms is photosynthesis. The simple plants began the process of photosynthesis and the life forms we see today were created.
In conclusion, no matter what theory you believe each has valid statements. Ultimately, it is up to you as a person to choose how you believe how ...

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PAPER DETAILS

Added: 11/10/2013 07:54:52 PM
Submitted By: MarlanaR
Category: Biology
Type: Premium Paper
Words: 360
Pages: 2

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