The First Known Fossils of Living Cells Were Preserved in Rocks

Multiple Choice

The first known fossils of living cells were preserved in rocks that are 3.5 billion years old, but scientists postulated that the first cells arose many millions of years prior to this time. These first cells were most likely ...

A) aerobic, photosynthetic, eukaryotic.
B) aerobic, photosynthetic, prokaryotic.
C) anaerobic, heterotrophic, prokaryotic.
D) anaerobic, heterotrophic, eukaryotic.
E) anaerobic, chemotrophic, eukaryotic.