Searching for life is complicated. Which elements are critical and which ones are not? Which can we count as biosignatures and which can occur without life? 🦄 Get the extra part for free here:https://www.patreon.com/universetoday00:00 Intro01:36 Phosphorus and Earth life21:42 Biosignatures and Phosphorus38:00 Bonus part: Underwater Biology38:51 Current obsessions45:04 Final thoughts📺 VIDEO VERSIONhttps://youtu.be/Ppc3zzMTJTs📰 GUIDE TO SPACE NewsletterNo ads. Subscribe for FREE: https://universetoday.com/newsletter🎧 PODCASTSUniverse Today: https://universetoday.fireside.fm/Astronomy Cast: http://www.astronomycast.com/📩 CONTACT FRASER[email protected]⚖️ LICENSECreative Commons Attribution 4.0 International (CC BY 4.0)