Examlex
The more massive planets in the solar system tend to be less dense than the lower mass planets.
Object Permanence
The understanding that objects continue to exist even when they cannot be observed (seen, heard, touched, smelled, or sensed in any way).
Conservation
The act of preserving, protecting, or restoring the natural environment and its wildlife.
Cognitive Development
The construction of thought processes, including remembering, problem solving, and decision-making, from childhood through adolescence to adulthood.
Attention Span
The length of time a person can concentrate on a task without becoming distracted.
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