Tardigrades have survived every mass extinction on Earth since they evolved about a 1/2 billion years ago.There are ~1,300 known species.

And millions of years from now, they won’t even notice we’re gone.

https://www.smithsonianmag.com/smart-news/tardigrades-turn-out-not-be-dna-thieves-180964236/ #nature Image: Eye of Science/Science Photo Library