THE ORIGIN OF LIFE ON EARTH

The origin of life on earth

The origin of life on earth

Scientists to this day do not know how life came about on Earth. Yet, they continue to study many kinds of evidence and continue their research. At present there are three competing theories one how life on Earth came about. This essay presents the summary of the three 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.

Life arrived here from an extraterrestrial source. Swedish scientist Svante Arrhenius popularized the ...