Ever heard of a NEMATODE? You might be more familiar with their colloquial name, which is roundworm. For the purposes of this post, we'll refer to this creature as a nematode going forward but know that nematodes and roundworms are the same creature. Nematodes are found all over the world and are classified as extremophiles, which means that they have the ability to survive in climates such as polar deserts, the deep biosphere, and inside animal intestines! Wikipedia even lists a species of nematode (Caenorhabditis elegans) as being able to survive atmospheric descent back to Earth's surface.