Heterotrophic bacteria:
(a) are most abundant in nature
(b) are important decomposers
(c) help in nitrogen fixation, production of antibiotics, curd etc.

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a and b only

b and c only

c and a only

a, b and c

answer is D.

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Detailed Solution

Heterotrophic bacteria are most abundant in nature and they are important decomposers. They also help in nitrogen fixation, production of antibiotics, cud etc.

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