Final answer:
Tyler's sociability and thrill-seeking and Marco's preference for solitude and avoidance of risk are described by Eysenck's theory as stemming from their genetic predispositions and levels of extraversion.
Step-by-step explanation:
According to personality theorists Hans and Sybil Eysenck, we can explain the different personalities of Tyler and Marco by their genetic predispositions and level of extraversion. The Eysenck's believed that personality is largely governed by biology and identified two specific personality dimensions: extroversion/introversion and neuroticism/stability.
Tyler exhibits traits of someone high on extraversion, being sociable and a thrill-seeker. In contrast, Marco demonstrates traits associated with introversion, preferring solitude and avoiding risky behaviors. This psychological perspective emphasizes the role of inherited biological factors over social upbringing or cognitive development in determining personality traits.