"As seawater gets colder, it grows thicker. It’s basic physics — the density and viscosity of water molecules rises as the temperature drops. Under the conditions of Snowball Earth, the ocean would have been twice or even four times as viscous as it was before the planet froze over. Simpson wondered what it would have been like to be a microscopic organism in the ocean during Snowball Earth."

https://www.quantamagazine.org/the-physics-of-cold-water-may-have-jump-started-complex-life-20240724/

#BioPhysics #SnowballEarth #ComplexLife #Multicellularity #EvolutionaryBiology

A good (general) read about our current understanding of eukaryogenesis.
#eukaryotes #ComplexLife #complexity #evolution #EvolutionaryBiology

https://knowablemagazine.org/article/living-world/2023/how-endomembrane-system-of-eukaryotic-cells-evolved