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.
Making the world better, one answer at a time. Viruses are considered to be non-living because viruses are not cells, they don't use energy to grow, and they do not respond to their surroundings (breaks the seven characteristics of living things).In addition, they cannot reproduce without a host cell and cannot produce or consume nutrients.hey are alive in the sense that they are organic material, but not in the sense that they are independent living things.   Also they cannot respond to stimulus.   Most biologists today consider viruses to be nonliving because viruses do not have all the characteristics essential for life.