Answer:
His genetic make-up
Step-by-step explanation:
Many scholars consider the basic characteristics of man as his intelligence and personality. are already formed, "ready" at birth, due to their genetic make-up. For this reason, these scholars have always justified the presence or absence of the same personality in one or both parents (and even in other consanguines, whether or not separated). So, for example, Alexander grew up to have high levels of extraversion and kindness is because one of his parents too, which can prove that Alexander's personality is due to his genetic make-up.