Answer:
I think that it is mate selection though not sure
Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots isos and topos, meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.
Answer
solar system, a globe of earth
Actually, it is INNATE IMMUNITY. That is the proven right answer so be careful.
