Examlex
Which of the following statements is true?
Hypotheses
Tentative explanations or predictions that can be tested through observation and experimentation.
Phenomena
Observable facts or events that are subject to scientific examination and explanation.
Happiness
A state of well-being and contentment characterized by positive emotions ranging from satisfaction to intense joy.
Smiling
is a facial expression formed by flexing the muscles at the edges of the mouth, typically signaling joy, amusement, or sociability.
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