Answer:
Hydrogen ion
Explanation:
The proton gradient created by the electron transport chain provides a H+ to power ATP synthase.
<span>Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
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3, 1, 2, 5, 4. :-) I hope this helped. DNA is the smallest and the atmosphere is the largest.
