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Barrier
An obstacle that prevents movement or access from one place to another or impedes progress in achieving a goal.
Object Permanence
The understanding that objects continue to exist even when they cannot be seen, heard, or touched, typically developed in infancy.
Conservation
In environmental science, refers to the preservation, protection, or restoration of the natural environment and wildlife.
Identity Achievement
A stage in adolescent development where individuals have explored and committed to a set of personal beliefs and goals.
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