Comment by ck2

mitochondria are just so incredibly fascinating in every aspect

they are like another lifeform not just living in our lifeform but making it possible

even their mere existence might be alien or even explain the lack of alien life detected so far

PBS Space Time has yet another awesome episode on that

https://www.pbs.org/video/is-there-a-simple-solution-to-the-...

https://www.youtube.com/watch?v=abvzkSJEhKk