Children who become fluid in two languages develop denser synaptic connections in areas of the left hemisphere devoted to language.

The psychoanalytic theory emphasizes that how parents manage their child’s sexual and aggressive drives in the first few years is crucial for healthy personality development.

Ethnicity, culture, and general environmental influences have nothing to do with development.

Piaget’s sensorimotor stage spans the first ________ years of life.

Gross-motor development has to do with smaller movements, such as reaching and grasping.

The germinal period lasts about ____________.

Of all the motor skills, reaching may play the greatest role in infant cognitive development.

Proactive and reactive aggression comes in three forms:

According to the concept of gene-environment correlation:

Isotopes of the same element have different numbers of _________ relative to each other, and would also have different __________ numbers.