1 Table of Contents: “... archaea -- Human fecal virus -- Sargasso Sea marine microbial metagenome -- Human distal gut microbiome...”

2 “... enabled bacteria and archaea to live in places no other organism can tolerate. They are found...”

3 “... enabled bacteria and archaea to live in places no other organism can tolerate. They are found...”

4 “... of the discovery was that the Archaea, previously thought to be a curious subgroup of bacteria restricted...”

5 “... of the discovery was that the Archaea, previously thought to be a curious subgroup of bacteria restricted...”

6 “... bacteria, archaea, viruses, and microbial eukaryotes--provides researchers insights into the processes...”

7 “... bacteria, archaea, viruses, and microbial eukaryotes--provides researchers insights into the processes...”