Examlex
When both sides of an equation are multiplied by the same __________ real number the solution to the equation is unchanged.
Facial Expressions
The use of the muscles of the face to display emotions, intentions, or social information, commonly understood across cultures.
Charles Darwin
An English naturalist, geologist, and biologist best known for his contributions to the understanding of evolution through natural selection.
Emotions
Complex psychological states that involve three distinct components: a subjective experience, a physiological response, and a behavioral or expressive response.
Facial Expression
The movement of the muscles beneath the skin of the face, used to convey emotional states or reactions.
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