Viruses do not have:

Explanation

Viruses do not have a fossil record because they lack hard structures such as bones, shells, or cell walls that can be preserved over time. They are made up only of nucleic acids and protein coats, which are too small and fragile to leave traces in rocks or sediments. In addition, their tiny size and dependence on living cells make it nearly impossible for them to be fossilized. Instead of fossils, scientists study the evolutionary history of viruses through their genetic material and by comparing it with that of their hosts.