The only metalloid located in the sixth period of the periodic table is Astatine. Others are located in previous periods.
Carbon needs four more valence electrons, or a total of eight valence electrons, to fill its outer energy level.
The answer is: Survival of the form that will leave the most copies of itself in successive generations.
"Survival of the fittest" is a phrase that originated from Darwinian evolutionary theory.
This is example of natural selection and adaptation.
Genetic variation is important to the population's ability to survive in different situations that affect natural selection.
The environment is constantly changing and different alleles are favored.
