Why is it so difficult to classify organisms?
It is difficult to classify organisms because they are many...
Classification of organisms is a hard task cause many organisms have their differences and similarities, whereby making it very complicated in classifying organisms..
All living organisms are classified into groups based on very basic, shared characteristics..
Organisms within each group are then further divided into smaller groups..
These smaller groups are based on more detailed similarities within each larger group..
So doing all that with organisms you choose to classify, its very voluminous and a hard task to do.