Although nitrogen gas makes up 78% of the atmosphere, we can't use it because _____.

Question

we must absorb it through the sun
nitrogen gas is explosive
nitrogen atoms must be broken apart first
we must absorb it through the soil

Answer 1

Although nitrogen gas makes up 78% of the atmosphere, we can't use it because nitrogen atoms must be broken apart first.

In nature, nitrogen gas (N₂) is very stable and is not in a form that most organisms can directly use. Plants and animals need nitrogen in more reactive forms, such as ammonia (NH₃) or nitrates (NO₃⁻), which are typically made available through the processes of nitrogen fixation carried out by certain bacteria and other organisms.