Actually, everything does not come in various sizes. Do the atoms of the ocean come in various sizes?
Are you suggesting that hydrogen atoms are the same size as oxygen atoms?
Have you ever seen a pebble as big as a boulder?
"Pebble" and "boulder" are names for the relative sizes of rocks, not rocks themselves.
Ever seen an elephant as small as a mouse...
I would contend that mouse embryos and elephant embryos start out about the same size.
...or a volcano as big as an ant hill?
Well, you seem to be pretty good at making mountains out of a mole hills.
I could go on, but you get my drift.
Yes, I get that you completely miss my point. Mice and elephants are mammals that are vastly different in size. Pebbles and boulders are rocks that are vastly different in size.
I could go on, but you get my drift.