Inherited traits are traits that you are born with, they are in one's genes. Natural selection is the concept of "Survival of the Fittest" where only those who have the most beneficial of genetic traits survive to pass on their genetic code onto the next generation.
Atoms of the same elements differing in the number of neutrons in their nuclei are known as isotopes. Thus, isotopes of an element have the same atomic number but different atomic mass number. Isotopes of an element have similar chemical properties but different physical properties.
