As seawater gets colder, it gets more viscous, making it difficult for small organisms to navigate. This could have pressured single-celled organisms into developing ways to form larger groups and move with more force, potentially leading to the leap to multicellular life.
Experiment on green algae by Carl Simpson and team showed their behavior under higher viscosity. This mirrors the conditions single-celled organisms might have faced during Snowball Earth, suggesting a link to the evolution of multicellular life.
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