E - The Eye chart of reality
The most important idea/thing/'reality' in each natural science?
Physics - Energy ...this one seems the muddiest and least conclusive
Chemistry - Elements
Biology - Evolution
The most important idea in the social sciences is....
Some great sentence of emergence in the natural sciences.
"The modern concept of energy emerged[when?] from the idea of vis viva (living force), which Leibniz defined as the product of the mass of an object and its velocity squared,[full citation needed] he believed that total vis viva was conserved."
"The advent of polymers that could replicate, store genetic information, and exhibit properties subject to selection was, it suggested, most likely a critical step in the emergence of prebiotic chemical evolution."
Zero is my hero? https://www.newscientist.com/lastword/mg25333771-200-if-energy-cannot-be-created-or-destroyed-where-does-it-come-from/
If energy cannot be created or destroyed, where does it come from?
Or 42. :)