 Quote by fluidistic
I also find surprising the fact that all animals require many different type of ions such as sodium, potassium and calcium for their brain to function. I would not have thought that bees, ants for example or snails would have needed them.
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It's because our common ancestor had already evolved these systems, you might like to read the following publication:
Big ideas for small brains: what can psychiatry learn from worms, flies, bees and fish?