Answer:
(a) In animals
anaerobic respiration occurs in the situation of deficiency of oxygen during heavy
exercise when pyruvic acid is reduced to lactic acid by the enzyme lactate dehydrogenase.
(b) In yeast, the
incomplete oxidation of glucose occurs under anaerobic conditions, where
pyruvic 'acid is converted to 
and
ethanol by the action of enzyme pyruvic acid decarboxylase and alcohol
dehydrogenase.
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