Living in the Underground

So a form of asexual reproduction?

mhm, mainly since the only form of reproduction that either of our species’ have otherwise only happens as a result of damage, which is very not optimal

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Also I do hope we have a good level of oxygen tolerance with our critters…

So basically like planulocysts that just instantly become polyps istead of ever being planulas?

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Will we learn about the continents of the planet once the glaciers come off it’s face?

Thinking of a supercontinent when the ice melts…

if we don’t, we can always make our membranes so thicc barely any oxygen can pass through(what cyanobacteria did), or evolve a cell wall oxygen can’t pass through(probably a really bad idea for anything that isn’t exclusively an autotroph) or become huge to minimize oxygen exchange with the environment

Why wouldn’t we be able to increase our oxygen tolerance?

Well, since the crust cracks barely have oxygen, they don’t have much oxygen tolerance.

But will they be able to increase the tolerance?
And will we have to make our critters tolerant to smaller pressures before heading to the surface?

if you don’t have any oxygen inhibited processes, you could, but otherwise, you’d at least want some cells oxygen can’t get into

that tends to only apply to macroscopic creatures(or at least creatures bigger than a tardigrade), unless it’s a hydrothermal vent adapted eukaryote heading to the surface, but then you have much more to worry about

Yes, tolerance can be increased, as long as there are no oxygen inhibited processes. Oh yeah, and pressure adaptation.

And some desiccation adaptations will be needed for life out of the water I presume.

Yes, as well as temperature adaptations for going into the cold oceans.

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Shouldn’t be already be in a rather cold water?

No, the crust cracks are warm due to geothermal heat.

I see. Still shouldn’t there be colder zones near the ice?

Yes, the lower crust cracks are around hydrothermal vent heat, while the upper is around room temperature.

And all our critters currently live near the vents?

They currently live somewhere in the middle.