Discussion of everything related to the Theory of Evolution.
Exactly. On other planets, if there was life based on other chemicals, totally other conditions may be favorable for the life and thus the life forms will look differently
Cis or trans? That's what matters.
that is true to some extent, but i think that even with a world made out of Si instead of C, the same principles of evolution would create creatures that might have some common features
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
not necessarily. I mean think of it. It makes sense to concentrate things, for example control (nervous) organs, which will probably wind up in a sort of brain. brains evolved at least twice independently on earth. It makes sense to have a sort of lens organ (eye) that should be placed in the part that first meets the environment. Eyes have evolved at least 6 or 7 times on Earth. If you want to fly a wing-like organ will most likely be the solution, and wings have evolved 3 or 4 times on earth. Etc etc.
On the sacale of the Universe, with finite construction possibilites, it's inevitable that biology is constructed on a planet with the same specifications of the Earth. Which is to say, that the emergence of biology is inevitable and exists through-out the Universe.
We don't even know if life actually began on the Earth. Some people have suggested that it may have been carried here e.g. along a meteorite or such. Maybe the early Earth wasn't suitable for the beginning of life after all, but instead some other place was?
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