FAST PLEASE HELP All atoms of the same element must have the same number of O protons.
O neutrons.
O compounds.
O electrons.

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.