According to two recent types of research, animals' DNA contains a "graveyard of viruses" that functions behind the scenes to defend them from various illnesses. Non-coding genes in mammals' bodies, which have long been classified as "junk DNA," maybe shielding humans against old viruses, according to the research. When a virus infects us, it leaves a portion of itself in our DNA, according to the experts. When DNA is found in an egg or sperm cell, it is handed down through the generations. These viral fragments were found in the genomes of 13 marsupial species, including the tammar wallaby , koalas, opossums, fat-tailed dunnarts, and Tasmanian devil. These viral particles were kept for a reason... We would anticipate all DNA to alter throughout millions of years of evolution. These fossils, on the other hand, have been preserved and are still entire. This might be a system that works in a similar way as vaccination but is passed down the generations. Th...