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Who discovered oxygen in 1774 and described it as "dephlogisticated air"?
Cognitive Development
The process through which a person's ability to think, understand, and learn evolves over the course of their life, starting from infancy.
Symbolic Functions
Cognitive operations that enable a person to use symbols, signs, or objects to represent something that is not physically present.
Preoperational Stage
A stage in Piaget's theory of cognitive development, typically from ages 2 to 7, characterized by symbolic thinking, egocentrism, and difficulty understanding conservation.
Motor Skill
A learned ability to cause a predetermined movement outcome with maximum certainty, often involving the coordination of muscles and mind.
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