Examlex
Oxygen did not build up in the atmosphere as soon as life began to produce it because the oxygen was pulled back out of the atmosphere by reactions with surface rocks.
Adolescents
Young people typically between the ages of 13 and 19, undergoing the transition from childhood to adulthood.
Music Lyrics
Written words that are part of a song, often expressing emotions, stories, or ideas.
Hypothesis
A tentative explanation or prediction that can be tested through research and experimentation.
Research Question
A question that defines the focus or purpose of a study, guiding the research methods and analysis.
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