**Its nitrate**
Nitrogen (N) + Oxygen (O) = nitrate
The right answer is the organ level.
The organization performs its functions (nutrition, relationship, reproduction) through its organs that form systems (or devices). Each organ is composed of tissues that are sets of specialized cells.
Some organisms perform all of these functions when they consist of only one cell: they are unicellular organisms.
Answer:
Bacteria turn nitrogen gas into a form that living things can use
Answer:
we need more details how are we supposed to answer this
Explanation:
I think is (a) because that's the only one that changes gradually over time
