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The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as:

  1. A
    Heterotrophic bacteria
  2. B
    Cyanobacteria
  3. C
    Archaebacteria
  4. D
    Chemosynthetic autotrophs

Solution & Step-by-step Explanation

Heterotrophic bacteria are the most abundant in nature. They include decomposers and many species useful to humans, such as Lactobacillus (curd making) and those used to produce antibiotics (like Streptomyces).

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The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as:
A
Heterotrophic bacteria
B
Cyanobacteria
C
Archaebacteria
D
Chemosynthetic autotrophs

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