My guess would be "no." But anybody else's guess is as good as mine. We have no data.
Speculation without data is fun, and all, but it is not really anything to do with science.
What would aliens look like?
Austin Evans
Kevin Sanders
>RNA comes before DNA
correct me if I am wrong, and I may be, but is not RNA made by DNA interacting with various enzymes an' shit?
In any case, even if a RNA/DNA system was the only way to get to life, why would we assume that this would lead to similar looking organisms?
Ethan Martin
Do you even bother to read the posts a few posts above, or just shitpost without having the courtesy to look what's already been said?
>why would we assume that this would lead to similar looking organisms?
Read this.
Mason Ross
>What would aliens look like?
>Would they look like to the forms of life of our Earth because of evolutive convergence or not?
Half the life forms on Earth look like fucking aliens. Look at that deep water shit, or a platypus, or an ostrich, or a scorpion... life on Earth is unbelievably varied. You could design basically anything and probably find a correlation in the sea. Out of the sea, physiology starts to set a few more parameters; invertebrate/vertebrate, warm/cold blooded, endo/exo skeleton, limbs/wings, etc. Lower down the evolutionary tree the variety is immense, and the potential for variety on an alien world with similar life-supporting conditions to Earth would be equally high, i.e. equally varied. So whereas an alien biologist might look at an Earth angler fish and say, fuuuu dat crayzee fish got a fishing rod and light on its head, on their planet the angler might be an octopus with a collection of tiny tentacles which mimic a shoal of fish.
The point here is, life evolves to flourish in ecological niches, yes evolution does show convergence, but the scope for variety lower down the evolutionary tree is still immense.
Further up the evolutionary tree, physiology starts to set its parameters more stringently and the only real options for higher intelligent lifeforms which manipulate their environment (fire, tools, technology) are humanoid.