(8/n)
...upper water levels nowadays vastly become extinct, too as the 1,000-year-circle of nutrients in the #GlobalOceanConveyorBelt?
I don't know what happened to ocean life when the #ChicxulubImpactor, the #asteroid that struck the #CaribbeanOcean off the coast of #Yucatán/#Mexico 66 million years ago and created an #ExtinctionLevelEvent (#ELE):
(If you haven't seen it, this visualization is quite captivating:)
https://www.youtube.com/watch?v=5qJPTjMnwNk
Presumably, the whole food-chains...