<span>Psychologists perform twin studies in order to determine the extent to which genetics influence intelligence levels. Since identical twins share 100% of their genetics, it follows that their intelligence levels should be quite similar given that intelligence is genetically determined. However, when identical twins are found to have varying intelligence levels, it indicates that external factors (or nurture) play a role in intelligence. Therefore, p</span>sychologists perform twin studies in order to determine the extent to which genetics and non-genetic factors determine intelligence levels.
The part of the government, or should we say the person who represents the nation and sets the policy in it is the President. The president is considered as the leader of the country, and they are the main representatives who often attend summits where national matters are discussed internationally.