Here's why:

* Energy releasing metabolic: Fermentation is a metabolic process that generates ATP (energy) from the breakdown of organic molecules.

* Substrate oxidised: During fermentation, a substrate like glucose is oxidized, meaning it loses electrons.

* Without an external electron acceptor: Unlike aerobic respiration, where oxygen acts as the final electron acceptor, fermentation doesn't require an external electron acceptor. Instead, an organic molecule within the cell (like pyruvate) acts as the final electron acceptor.

Key Features of Fermentation:

* Anaerobic: It occurs in the absence of oxygen.

* Lower ATP yield: It produces significantly less ATP than aerobic respiration.

* Waste products: Fermentation produces various waste products, such as lactic acid (in lactic acid fermentation) or ethanol and carbon dioxide (in alcoholic fermentation).

Examples of Fermentation:

* Lactic acid fermentation: Used by bacteria in yogurt production and by our muscle cells during intense exercise.

* Alcoholic fermentation: Used by yeast in bread making and alcoholic beverage production.

Let me know if you have any other questions!