Question

how do most plants obtain usable nitrogen? absorption of nitrogen gas absorption of nitrates from the soil ingestion of nitrogen compounds nitrogen fix through their r

Explanation:

Plants cannot directly use atmospheric nitrogen gas. Nitrogen - fixing bacteria convert atmospheric nitrogen into nitrates and other usable forms in the soil. Plants then absorb these nitrates through their roots. Ingestion is not a way plants obtain nitrogen as they are autotrophs and do not consume other organisms for nitrogen.

Answer:

Absorption of nitrates from the soil