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Slightly related:

Aliens in our midst

In fact, they were profoundly different from any other animal on Earth.
…
The ctenophore was already known for having a relatively advanced nervous system; but these first experiments by Moroz showed that its nerves were constructed from a different set of molecular building blocks – different from any other animal – using ‘a different chemical language’, says Moroz: these animals are ‘aliens of the sea’.
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Once you repeat the experiments, says Moroz: ‘You start to realise it’s a really different animal.’ He surmised that the ctenophore was not just different from its supposed sister group, the jellyfish. It was also vastly different from any other nervous system on Earth.
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It meant that the nervous system of the ctenophore had evolved from the ground up, using a different set of molecules and genes than any other animal known on Earth. It was a classic case of convergence: the lineage of ctenophores had evolved a nervous system using whatever genetic starting materials were available. In a sense, it was an alien nervous system – evolved separately from the rest of the animal kingdom.
…
The ctenophore represented the closest thing to an alien brain, or mind, on Earth




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acidmilk
 acidmilk      27.09.2019 - 16:01:12 (modif: 27.09.2019 - 16:01:29) [1K] , level: 1, UP   NEW !!CONTENT CHANGED!!
este vacsi naklad je podla mna toto

In fact, much of the basic signalling machinery of all nervous systems might have evolved from a life-or-death adaptation that arose in the first cells on Earth, four billion years ago. Early cells probably inhabited aquatic environments, such as hot springs or brine pools, that contained a mixture of dissolved minerals including some, like calcium, that threatened life. (Important biological molecules such as DNA, RNA and ATP are known to coalesce into refractory goo when exposed to calcium – similar to the scum that forms in bathtubs.) So biologists surmise that early life must have evolved ways to keep all but the lowest levels of calcium outside its cells. This protective machinery might include proteins that pump calcium atoms out of a cell, and an alarm system that goes off when calcium levels rise. Evolution later harnessed this exquisite responsiveness to calcium to signal within and between cells – to control the beating of cilia and flagella that microbes use to move, or to control the contraction of muscle cells or trigger the electric firing of neurons in organisms such as ours. By the time nervous systems began to emerge, roughly half a billion years ago, many of the critical building blocks were already set.

povinne citanie pre vsetkych insitnych evolucnych biologov na kybci, co budu donekonecna filozofovat o tom ktora adaptacia na aky ucel sluzi