Which one of the following statements best reflects the idea that multiple layers of a child's environment affect the child's development in one way or another?
1) Typical teaching practices tend to be different at different grade levels; for instance, first-grade teachers tend to engage students in many hands-on practices, whereas high school teachers depend more heavily on short lectures and textbook readings.
2) Even if children inherit very "intelligent" genes, they cannot become bright, well-functioning individuals if they don't also have adequate nutrition to support their neurological development during the prenatal period, infancy, and early childhood.
3) Parents are certainly important in fostering children's cognitive and social development, but they can be more effective in their parenting if they have the advice and support of friends, neighbors, and community agencies.
4) Some parents are warm and nurturing, others are controlling and punitive, and still others are largely uninvolved in their children's upbringing; such differences appear to lead to differences in children's personalities.