Which of the following statements is incorrect? (A) Most abundant bacteria are heterotrophic (B)...

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Which of the following statements is incorrect?
(A) Most abundant bacteria are heterotrophic
(B) A large number of antibiotics are produced by actinomycetes (e.g, Streptomyces), which is a class of fungi
(C) \( \mathrm{N}_{2} \)-fixing bacteria pick up free \( \mathrm{N}_{2} \) from soil atmosphere and convert it into nitrogenous compounds.
(D) Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in exterme conditions.
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