Some kids are reared in homes with stairs, while others are reared in ground-floor homes with no stairs; yet, by school age, all climb stairs with equal average skill. This outcome ____ the maturational viewpoint.

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The maturational viewpoint suggests that development is primarily driven by biological maturation. The fact that all kids, regardless of their early environment (stairs or no stairs), can climb stairs with equal skill by school age supports the idea that development and acquisition of skills like stair climbing are largely determined by innate biological timelines rather than specific environmental experiences.

Some Kids Are Reared in Homes with Stairs, While Others