According to News Medical Life Sciences and Medicine, viruses are tiny organisms, which have nucleic acid backbones with protein coatings that lead to severe illnesses in plants, humans, and animals. Viruses are estimated to have originated billions of years ago, most likely evolving from some kind of parasitic organism, and evolved alongside the species that they infect. There are even traces of viral DNA inserted into animal genomes, including humans- up to 2% of our DNA is viral. This is a sign that our distant ancestors were infected with viruses too, and the stronger ones were able to take root in human genes. A virus can infect anything that is considered to be living. The virus infects a host cell, then releases its own DNA or RNA inside
