How does a law differ from a theory?
a law is a theory that has been proven to be true and universal
a theory is a group of hypotheses that prove a law is true.
a law is a statement of fact, but a theory is an explanation
a theory is a proposed law that has not yet been peer reviewed.

A law is a statement of fact but a theory is an explanation.

Explanation:

A law is in general a universally accepted fact. It remains true and the same in any part of the world it takes several years of experimentation to develop a law.  

A law is a statement that cannot be challenged at the present point of time with all its technological advancements. A theory is different from a law. It is an explanation of facts.  

Most acceptable one among several explanations becomes a theory. A theory doesn’t have a universal nature  like that of a fact.  

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.

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