In the time of the early Earth, Airgas, the supplier from which the researchers obtained their materials, was not around.
So how did the paper determine that photosynthesis has an “overall simplicity,” despite the complexity just described?
Bacteria that conduct electricity with cables may be involved in everything from cleansing the oceans and enriching the soil to guarding our own teeth.
Self-evidently, the gravity on the surface of a planet limits the maximum size of large terrestrial organisms.
The 4-4-4 rule says that we would perish without oxygen for four minutes, water for four days, or food for four weeks.