With no brains, no heart, and no blood, it's amazing jellyfish have existed for 650 million years! ➡ Subscribe: bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: bit.ly/NatGeoOfficialSite Facebook: bit.ly/FBNatGeo Twitter: bit.ly/NatGeoTwitter Instagram: bit.ly/NatGeoInsta See all National Geographic videos: video.nationalgeographic.com/?source=4001 Jellyfish | National Geographic youtu.be/9lIn3vPbHTs National Geographic www.youtube.com/natgeo