The labels "easy," "difficult," and "slow-to-warm-up" are used to refer to differences in an infant's

A) genome.
B) fitness.
C) temperament.
D) adaptability.

Slow-To-Warm-Up

Describes a temperament where individuals are initially hesitant in new situations or with unfamiliar people, but gradually become more comfortable over time.

Temperament

The inherent part of an individual's personality, including disposition and emotional reactivity, often noticeable from a very young age.

Genome

The complete set of DNA, including all of its genes, in an organism or cell.