In 2011, microfossil structures were found in sandstone about 3.4 billion years old and 20 miles from the site of J.William Schopf's discovery.What was distinctive about these microfossils was that they were
A) protocells, with no evidence of being living organisms.
B) similar but not identical to fossils found at nearby sites.
C) eukaryotic cells resembling green algae.
D) from cells that used sulfur, rather than oxygen, in reactions that released chemical energy.
E) from cells that were of heterotrophic creatures that fed on the cyanobacteria.

Question

Quizplus · Accepted Answer

Microfossils found in 3.4 billion-year-old sandstone were distinctive because they were from cells that used sulfur, rather than oxygen, in reactions that released chemical energy. This suggests an early form of life that thrived in an anaerobic environment.

In 2011, Microfossil Structures Were Found in Sandstone About 3