Answer:
Aerobic respiration, Anaerobic respiration in yeast, Anaeorbic respiration in muscles.
Step-by-step explanation:
1) Aerobic respiration: In this case pyruvate is broken down into water and carbon dioxide along with release of energy. It commonly occurs in mitochondria of cells.
2) Anaerobic respiration in yeast: In yeast cells during fermentation pyruvate is converted into ethanol and C02 in the absence of 02.
3) Anaeorbic respiration in muscles: Due to lack of oxygen, eg. during vigorous running or exercise, in human muscles, pyruvate is converted to lactic acid.