Can Organisms be re-classified? why would they sometimess be re-classified?

Answer 1

Owing to their phenotypic differences,they have been classified into the five main kingdoms which are prokaryotes,protoctists,fungi,plantae and animalia.
They could be re-classified as was the protoctists,which are eukaryotic in nature but have entirely differents characteristics.
Biochemistry of species can also be used for re-classifying species and would prove to be a lot more accurate.There are many species being discovered that belong to an entirely new group of species.This is why a new classification is sometimes considered,

Answer 2

Organisms are re-classified when:

1. We change classification systems -- like changing from a 5-kingdom system to a 6-kingdom system.
2. We learn something new about the organism -- like studying the DNA of an organism and finding out that we were wrong about which group it belongs in.

Answer 3

Organism can be re-classified due a DNA study which links them to a different Family, Genus, or species.
Cercidium microphyllum, also known as the Palo Verde tree, was once classified as Parkinsonia microphylla. After much research on the genome, it was re-classified under this different Genus.

Answer 4

Some of the old classification systems relied too heavily on phenotypic similarities rather than sequence similarity. So organisms may be reclassified for this reason. Also as more information is obtained about ribosomal RNA or DNA sequences which are highly conserved, reclassification can occur