Even if the well-known endosymbiotic theory is right, and once free-living single-celled organisms evolved to become organelles within larger cells, much remains unexplained about how, exactly, ...

The interactions between biological entities and their role in evolution has enthralled scientists for decades, but the causes and consequences of such interactions remain poorly characterized.

Bacteria are only the only organisms that are able to 'fix' nitrogen, or remove it from the atmosphere and convert it into a useful form. While some plants seem to fix nitrogen, it is actually ...