Different Scientists Have Speculated About How the First Living Thing

Multiple Choice

Different scientists have speculated about how the first living thing appeared on Earth. All of the following are supported by evidence EXCEPT

A) origin on Earth of a photosynthetic autotroph.
B) origin on Earth of a chemosynthetic autotroph.
C) origin on Earth of an anaerobic heterotroph.
D) an organism arrived from an extraterrestrial source.