Atoms are not changed in a reaction. They are just

rearranged

Explanation:

Atoms are the most basic unit of matter that makes up elements. Atoms are made up of electrons orbiting a nucleus comprising protons and neutrons.

The atomic number, is defined as the number of protons in an atom, while the atomic mass, is the number of protons and neutrons.

In reaction, atoms are not created or destroyed, the atoms simply become rearranged in new formats; molecules are two or more atoms bonded together. Different molecules can join together to form compounds.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.