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on the smaller scale, diversity decreases because every living thing is made up of atoms, but just with different arrangements of them.

and on the bigger scale, diversity increases because of what comes out of the different arrangement of the atoms that all living things are made up of.

but really, didn't the universe just look really empty and black and dusty at a bigger scale? doesn't that make it pretty poor in diversity?

so in the end, nothing is really different from each other, no? everything really is 'dust to dust' and 'ashes to ashes'.