Our bodies need oxygen to survive, just like many other organisms. Oxygen molecules are used to create a molecular fuel called ATP for our cells in an organelle called the mitochondria; this process ...

There are many levels at which a scientific question can be answered. An answer that is quite satisfying to a scientist from one discipline may be totally unsatisfactory to a scientist from another.

Bacterial evolution and oxygen adaptation: A timeline built from genomic, fossil, and chemical data. Colors show oxygen states: anaerobic (blue), aerobic (red), and proportion of aerobic lineages in ...