Questions: Heritability describes a proportion of difference among people that is attributed to genetics.

The answer is the first one: Heritability.

Explanation for each option:

• Heritability: This term refers to the proportion of variation among individuals in a population that is due to genetic differences. It is a measure used in genetics to estimate how much of the variation in a trait can be attributed to genetic factors. Therefore, this option correctly describes a proportion of difference among people that is attributed to genetics.

• Personality: This refers to the combination of characteristics or qualities that form an individual's distinctive character. While genetics can influence personality, the term "personality" itself does not specifically describe the proportion of differences attributed to genetics.

• Temperament: This is often used to describe the innate aspects of an individual's personality, such as mood, energy level, and emotional reactivity. Like personality, temperament can be influenced by genetics, but the term does not specifically refer to the proportion of differences due to genetics.

• Trait: This is a characteristic or feature of an individual, which can be influenced by both genetic and environmental factors. While traits can be heritable, the term "trait" does not specifically describe the proportion of differences attributed to genetics.

In summary, "heritability" is the correct term that describes the proportion of difference among people that is attributed to genetics.