The bacterial decomposition of nitrogenous organic compounds in the absence of abundant oxygen usually results in the formation of substances with an offensive odour,chiefly sulphur compounds. Such anaerobic decomposition is called:

In mature mammalian erythrocytes,the respiration is

Fermentation is represented by the equation

Fermentation is carried out by $.........$.

The end product of anaerobic respiration is

Given below are two statements.
$Statement-I$ - Skeletal muscles usually derive energy by anaerobic respiration.
$Statement-II$ - After vigorous exercise,lactic acid accumulates in muscle fibres,leading to muscle fatigue.
In the light of the above statements,choose the most appropriate answer from the options given below: