On the whole, it might be easier to conclude that the timing is somewhat off than that complex life started without oxygen. But symbiosis is an intriguing theory nonetheless.
Tag: oxygen levels (and multicellular life)
Claim: Complex cells started without oxygen
Yes, the ham sandwich was invented that way too. It started without any ham…
Did low oxygen levels limit evolution for billions of years?
Probably. The researchers propose 800 mya as the point at which oxygen increased. That’s when other researchers say they can identify chromosomes. Sounds like a rollout…