Question

What statement most directly demonstrates a way that the geosphere is involved in the nitrogen cycle?

Answer 1

That, nitrogen fixation happens in soil, by microbes, involving plant roots...

Answer 2

The fossil fuels are formed due to decay and decomposition underground over prolonged periods — the bacteria help in converting the nitrates and nitrites in the soil.

Plants usually absorb nitrogen and convert them into useful proteins.

These proteins are broken down eventually by animals and other compounds containing nitrogen when they consume it.