The nurse is conducting developmental screening for children in the pediatric clinic. A parent expresses concern that the 14-month-old is not yet walking independently, and their adult sibling's child is walking at 10 months of age. Which concept should the nurse use to provide information to the parent?

The underlying stimuli for physiologic changes are based on aggressive energies and the libido.

Development occurs in a series of subconscious stages that are impacted by social experiences.

Each child's pattern of biological development is unique, yet proceeds according to a genetic blueprint.

Intelligence proceeds when new information is adapted to the child's preexisting stage of development.