And ten more shall take his place
We don't need to. All modern theme parks are testaments to science.
I can't remember the last time I prayed a roller coaster with pyrotechnics into existence. Science and engineering on the other hand...
you are completely right. It was a terrible choice of words for that sentence.
I understand what you're saying here, but from everything we know (and we know a lot), the periodic table of elements is universal.
Some molecules (such as carbon or hydrogen) are simply so unique that they cannot be replaced by anything else. Nothing has the stability and bonding ability of carbon.
Similar things were thought about phosphate groups. Unfortunately, we were wrong.
The long and short of it is that no matter how hard you try, you'll never have an organism without hydrogen or carbon because there is simply no substitute. Same goes for a LOT of other things.
Sure, there will always be a lot of diversity and changes, but some things are simply universal.
We do have random, but it's random contained within limits set by chemistry and physics
If all else fails, lower your standards.