Microbial Life Has Been Identified at Depths of 3 Km

Question

Microbial life has been identified at depths of 3 km despite being anoxic.

Accepted Answer

There are several examples of microbial life found at depths of 3 km and deeper, including in underground aquifers, deep-sea vents, and subglacial lakes. These environments may be anoxic (lacking oxygen) but still support life through other means, such as utilizing alternative energy sources and metabolic pathways.