In the wild, the only tiger subspecies in the wild that have been observed to carry the white color is the Bengal tiger. Even all the white tigers that have been held captive are partly Bengal in subspecies. It is believed that the rare recessive gene that carries the white color comes from Bengal tigers only.
It is difficult to classify viruses as living organisms because they are not made of cells. They only become alive when they find a host i.e. a living cell to live in.ome algae are difficult to classify because they sometimes do not properly fit in one of the kingdoms since they may have characteristics from a few of the kingdoms.
6.3. 1  Classification of viruses is based on genome composition, virion structure, and host range. 2  The Baltimore virus classification emphasizes the form of the genome (DNA or RNA, single-or double-stranded) and the route to generate messenger RNA.3  Proteomic classification includes information from all viral proteins..1. 1  Viruses consist of noncellular particles that infect a host cell and direct its expression apparatus to produce virus particles. 2  A virion consists of a capsid enclosing a nucleic acid genome. 3  Some viruses are further enclosed by an envelope of membrane with embedded proteins.