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Walking and understanding language are examples of developmental:

Amilestones
Breflexes
Cdomains
Ddrives
Answer & Solution
Correct answer: A. milestones
1. Milestones are changes in specific physical and mental abilities. 2. They mark the end of one developmental period and the beginning of another. 3. Walking and understanding language are standard examples. _Source: Wikipedia, "Child development" (rev 1378784615), section "Milestones"_
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