what are two forms of mixed nitrogen?

Question

also.
______blank______ in the soil and in nodules on roots of some plants change or ____blank____ most of nitrogen gas.

please help.

i dont get it at all

ooopps not mixed nitrogen fixed

Answer 1

Converting nitrogen gas into more reactive (and useful) nitrogen compounds, such as ammonia, encompasses the first stage in the "nitrogen cycle". Once converted from its gaseous form, fixed nitrogen compounds allow plants to grow large and healthy. Animals gain access to this nitrogen by eating the plants, and deposit excess nitrogen in their feces. Fixed nitrogen is also returned to the soil when plants and animals die. Bacteria then decompose this organic matter first into ammonia, then into nitrites (like potassium nitrite: KNO2), and finally into nitrates (like potassium nitrate: KNO3), which are again used by plants. Additional bacteria return some of the fixed nitrogen back to the atmosphere (in the form of nitrogen gas), thereby regulating the whole cycle.

nitrites and nitrates