Living buildings
I imagine a biological creature, let's call it 'Marco' for now.
Marco can vomit living slimes that survive by attaching to the ground and by doing photosynthesis, at first soft can be shaped and modeled before it hardens permanently.
When hardened it can fuse with other slimes vomited to form various structures. The slimes are made of living mass that can be eaten again by Marco but are poisonous to anyone else.
Marco has managed to create a living underground bunker to defend from other creatures, the bunker looks something like this, outer bio-structure with underground space.
My question is, can a creature like Marco evolve naturally without being created by gods or mad scientists?
This post was sourced from https://worldbuilding.stackexchange.com/q/107270. It is licensed under CC BY-SA 3.0.
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