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Developmental change runs parallel to age, but its basic causes are:

Aage and calendar time
Bgenetic and environmental
Cschool and curriculum
Dgrowth and decline
Answer & Solution
Correct answer: B. genetic and environmental
1. Age itself cannot cause development. 2. The basic causes of developmental change are genetic and environmental factors. 3. Genes and environment often interact rather than acting as separate mechanisms. _Source: Wikipedia, "Child development" (rev 1378784615), section "Mechanisms"_
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