Amixture is made of different materials that can easily be separated.

A heterogeneous mixture is made of different materials that can easily be separated.

Explanation:

Heterogeneous mixture is characterized by a non uniform composition, it contains physically distinct component for examples sand and sugar, oil and water or potassium permanganate crystals and copper sulphate crystals. In this mixtures you can see the distinct components, for example you can separate easily particles of sand and sugar.

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.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.