Anoxia is a state of total oxygen deprivation within tissues or organs. It is an extreme form of hypoxia – a condition characterized by insufficient availability of oxygen. The damage caused by partial or complete lack of oxygen supply is known as hypoxic/anoxic injury.
The evolution of tree roots may have triggered a series of mass extinctions that rocked the Earth's oceans during the Devonian Period over 300 million years ago, according to a study led by scientists at IUPUI, along with colleagues in the United Kingdom.
Oxygen levels in the ancient oceans were surprisingly resilient to climate change, new research suggests.