Bacillus subtilis are

Hay bacteria

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Nitrifying bacteria

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Ammonifying bacteria

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Intestinal bacteria

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Solution

The correct option is A Hay bacteria
Bacillus subtilis are also called as hay bacillus. They are gram-positive bacteria. They are commonly found in hay or upper layer of soil. Hence, they are called as hay bacteria. They are also found in the GI tract of ruminants and humans. They are obligate aerobes.
Thus, the correct answer is 'Hay bacteria.'

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