Peat is an organic fuel consisting of spongy material formed by the partial decomposition of organic matter, primarily plant material in wetlands such as swamps ferns and mosses. The development of peat is favoured by warm, moist climatic conditions.

The main producers of peat Sphagnum most occurs in bogs. The accumulation of Sphagnum plant in due course of time lead this plant to get hardened and change into peat.

Peat is used in preparation of ethyl alcohol, peat, tar, ammonia, paraffin, etc. Peat is also used in covering the roots during transportation. This enormous value shown by peat for man kind makes it as an important domestic fuel and economic source for man kind.

Classification has been a centre piece of biology ever since Linnaeus, providing a frame work on which existing knowledge can be organised and predictions about unknown traits can be made.

But the basis of biological classification has gone through a series of upheavals over the last 3 centuries, from being considered a plan in mind of the creator, to the neutral assessment of over all similarity, to a reflection of evolutionary niches and finally to a phylogenetic mapping of the tree of life. e.g., in two kingdom classification their are two groups, i.e., Plantae and Animalia.

These groups are made on the basis of structural and cellular difference like plant possess cell wall, central vacuole, whereas animals lack cell wall and central vacuole but the drawback in this system classification is that eukaryotic and prokaryotic organisms like Euglena, bacteria and fungi are not included in this kingdom classification.

That are later added in three kingdom classification that in (kingdom-Protista) finally 1969, Whittaker purposed five kingdom classification.

These classifications are done on the basis of increase in understanding regarding organism by the advancements made in scientific techniques and by observing minute detailing that has led this classification more detailed and scientifically correct.