If one scientist's theories prove correct, the largest biomass in the world may not be in the oceans, but under them. Perhaps 111 million years old to boot. Stephen Gould once said evidence seems to indicate that as soon as life could exist on Earth, it did. It now seems increasingly likely that, barring something that destroys the planet outright, it always will.

Heck something like that may even be able to tolerate the Sun's future expansion into a red giant.