Final answer:
According to psychologist Charles Spearman, intelligence is made up of two factors: general intelligence and an individual's specific mental abilities.
Step-by-step explanation:
According to psychologist Charles Spearman, intelligence is made up of two factors: general intelligence and an individual's specific mental abilities. Spearman believed that there is a common underlying factor, known as g, that is responsible for general intelligence and can be measured and compared among individuals. At the same time, he acknowledged the importance of individual differences in specific mental abilities.