Individual differences in development refer to the variations observed among individuals as they grow and learn. Not everyone follows the exact same timeline or possesses the same abilities at similar stages.
This statement is inaccurate. Milestones are general indicators, but children reach them at unique times.
This accurately describes individual differences. Each child develops at their own pace (rate) and has different levels of ability (capacity) for various skills.
This is incorrect. Development is a complex interplay between heredity (genes) and environment (experiences).
This is incorrect. While developmental ranges exist, skills do not appear at absolutely fixed ages for all children.
The core of individual differences lies in the unique progression, or rate, and potential, or capacity, unique to each child's developmental journey.