Examlex
What is the formula mass of a molecule of CO2?
Conservation
The understanding that certain properties of objects remain the same despite changes in their form or appearance.
Conservation
The act of preserving, protecting, or restoring the natural environment and wildlife to prevent depletion or destruction.
Barrier
An obstacle that prevents movement or access, or a circumstance or issue that prevents people from understanding each other or from achieving their goals.
Preoperational Period
A stage in Jean Piaget's theory of cognitive development (approximately ages 2-7) during which children begin to engage in symbolic play and struggle with logic.
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