“the scientists found a complex structure of layered calcite crystals held together by super-hard natural cement.”
Almost as if someone(thing) designed them.
There's a Box jellyfish with two totally different kinds of eyes ~ which is rare enough anywhere, but one of the two types DOESN'T WORK. It may have a different purpose ~ maybe as a display light in a control console.
Look, after the formation of the Oceans several billions of years ago just all sorts of things had to fall out of hyperspace ~ and still be here.
Remember, spacefaring humanity is going to take living repair kits and parts making tools with them ~
No, no, no! Over billions of years and thousands of tiny mutations things like this happen. This is proof of evolution and this is the best fit for this environment. Other urchins without this adaptation simply went extinct, but there’s no reason to believe that these urchins were engineered by a higher power...
Unless you mean aliens?