Bacteria are essential to life on earth because: (a) They are decomposers. (b) They are capable of converting atmospheric nitrogen into nitrates. (c) They help to recycle essential chemical elements. (d)

Bacteria are essential to life on earth because: (a) They are decomposers. (b) They are capable of converting atmospheric nitrogen into nitrates. (c) They help to recycle essential chemical elements. (d) All of the above are correct.

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