What causes a organism to use the process of anaerobic respiration?

Anaerobic respiration occurs in organisms when oxygen is scarce or absent, making it essential for survival in low-oxygen environments. This process allows them to generate energy by breaking down glucose without oxygen, often resulting in byproducts like lactic acid or ethanol. Organisms such as certain bacteria, yeast, and muscle cells in animals utilize anaerobic respiration to maintain energy production when aerobic respiration is not feasible. It is a less efficient energy production method compared to aerobic respiration, but it enables survival under challenging conditions.