From Cells to Us…How!? | The Biology of Life Explained
Jun 19, 2026 · 41 min · 10 segments
Any thoughts? Text me! Before the Cambrian Explosion came the weirdest chapter in animal history. In this episode, we head back to the Ediacaran…
Jackie MullinsHost
Now, before we meet these astounding organisms, I need to revisit something we talked about last episode because there's a bit more to it.
Last episode, I told you about Snowball Earth, that it was catastrophic, that most life died, that survivors huddled in refugia around hydrothermal vents, and that the thaw released a supercharged ocean full of nutrients and opportunity, the Aldi Restock Wednesday of geological history.
And all that is true, but I feel like I didn't put enough emphasis on why Snowball Earth basically made multicellularity, which recent studies suggest.
Because if left in a perfect environment, single cells would have stayed single.
They'd be hanging in their bachelor pads, their chi sheds, eating last night's pizza for breakfast.
But when life got hard, when the Earth literally froze over, they needed help.
Why? Why did they need help in this freezing earth? Well, cold water is thicker than warm water.
Water does the same thing, it's just a lot more subtle because it's already a pretty thin liquid to begin with.
But a single cell? Well, for a single cell, this isn't a subtle change at all because cells are microscopic, right? And at that scale, water already feels like you're swimming through syrup compared to what we experience.
Cold water makes that syrup thicker, even harder to push through, even harder to find food in.
Imagine trying to sprint through a pool of honey to catch your dinner like every day.
but a cluster of cells, bigger, faster, better at pushing through viscous water, better at capturing what little food existed.
Now, before we meet these astounding organisms, I need to revisit something we talked about last episode because there's a bit more to it.
Last episode, I told you about Snowball Earth, that it was catastrophic, that most life died, that survivors huddled in refugia around hydrothermal vents, and that the thaw released a supercharged ocean full of nutrients and opportunity, the Aldi Restock Wednesday of geological history.
And all that is true, but I feel like I didn't put enough emphasis on why Snowball Earth basically made multicellularity, which recent studies suggest.
Because if left in a perfect environment, single cells would have stayed single.
They'd be hanging in their bachelor pads, their chi sheds, eating last night's pizza for breakfast.
But when life got hard, when the Earth literally froze over, they needed help.
Why? Why did they need help in this freezing earth? Well, cold water is thicker than warm water.
Water does the same thing, it's just a lot more subtle because it's already a pretty thin liquid to begin with.
But a single cell? Well, for a single cell, this isn't a subtle change at all because cells are microscopic, right? And at that scale, water already feels like you're swimming through syrup compared to what we experience.
Cold water makes that syrup thicker, even harder to push through, even harder to find food in.
Imagine trying to sprint through a pool of honey to catch your dinner like every day.
but a cluster of cells, bigger, faster, better at pushing through viscous water, better at capturing what little food existed.
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