Biology 9700 · AS & A Level · Cells as the basic units of living organisms

Cells as the basic units of living organisms — practice question

The diagram illustrates a section of the nitrogen cycle. Which sequence of numbers correctly indicates the roles of the different kinds of microorganism in the nitrogen cycle?

A2, 4, 3
B3, 1, 2
C3, 1, 4
D4, 2, 1

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