Answer:
C
Explanation:
The Periodic Table organizes the elements according to their properties. One atom of each element is made up of protons, neutrons, and electrons. The number of electrons determines how an element reacts. The number of protons gives the element its identity.
Each upright domino is also full of potential energy. When the first domino falls, the force of gravity turns that potential energy into enough kinetic energy to topple a domino larger than itself.
I believe the answer is...a change in allele frequency over many generations!
Hope this helps!
To obtain oxygen.............
