Final answer:
Intelligence is a combination of genetic and environmental factors, with research showing that both genetics and the environment play a role in shaping an individual's intelligence. Twin studies have revealed a genetic component to intelligence, while environmental influences such as stimulation and intellectual stimuli also contribute to intelligence levels.
Step-by-step explanation:
Intelligence is a combination of genetic and environmental factors. Research has shown that both genetics and the environment play a role in shaping an individual's intelligence. Twin studies have revealed a genetic component to intelligence, as identical twins raised together or apart exhibit a higher correlation between their IQ scores compared to siblings or fraternal twins. On the other hand, environmental influences, such as rich stimulation and intellectual stimuli, also contribute to intelligence levels. Therefore, intelligence is not solely determined by genetics or the environment, but rather a combination of both factors.