What cause anaerobic respiration?

Anaerobic respiration occurs when oxygen is scarce or absent, prompting organisms to generate energy through alternative pathways. This process typically involves the breakdown of glucose without oxygen, resulting in byproducts such as lactic acid in animals or ethanol and carbon dioxide in yeast. It is commonly seen in certain bacteria, yeast, and muscle cells during intense exercise. Anaerobic respiration allows organisms to survive and produce energy in low-oxygen environments.