Anoxic

Hypoxic: Hypoxic refers to an environment with low levels of dissolved oxygen but still contains some amount of it compared to an anoxic environment.

Eutrophication: Eutrophication is the process by which a body of water becomes enriched with excessive nutrients, leading to increased plant growth. This excess plant growth can result in oxygen depletion and the creation of anoxic conditions.

Anaerobic Respiration: Anaerobic respiration is a metabolic process that occurs in the absence of oxygen. It is used by certain organisms to break down organic matter and release energy.