Biology (and other Life Sciences)

On page 410 of your textbook, there is a summary statement concerning what scientists believe about the origin of life on earth. Summarize the three (3) current competing theories of the origin of life on Earth: it arrived from an extraterrestrial source, it originated as a heterotroph, it originated as an autotroph.

Page 410 summary
As a result of this discussion you should understand that we do not know how life on Earth originated. Scientists look at many kinds of evidence and continue to explore new avenues of research. Thus, currently there are three competing theories of the origin of life on Earth:

1. Life arrived here from an extraterrestrial source.

2. Life originated on Earth as a heterotroph.

3. Life originated on Earth as an autotroph.


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