Viruses

We live in a world of viruses, there is a lot of different viruses and they are almost everywhere. Even ocean may contain viral particles. When it comes to animlas, mammals may carry at least 320,000 different species of viruses. But  when it comes to people, they may not know that they are dealing with viruses in everyday life. But even if lots of plants, animals, bacterias are infected, many of those viruses may bring adaptive benefits to life on Earth. In fact we wouldnt be albe to live without them, we wouldnt have arisen form the primordial muck. Two lengths of DNA originate form viruses and now they are in the genomes. Genomes without which pregnancy would be impossible. Another thing is that there is viral DNA among animals genes and it helps them store memories. Other genes coming from viruses can regulate immune system or even resist cancer. This shows that viruses play important role in life and help with evolution. If there werent any viruses biological variety would just collapse. So they can be useful too, but viruses are phenomenom- they are not always bad and not always good, they may lead advantage or destrucion so they seem dangerous. 

Viruses are really complicated and they depend on situations and everything around. They can evolve quickly and spread all over the World, like SARS-CoV-2 which still exists in humans and is capable of further evolution.


https://www.nationalgeographic.com/magazine/article/viruses-can-cause-great-harm-but-we-could-not-live-without-them-feature

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