Examlex
Using a survey tracking almost 8,000 seventh- through twelfth-graders for one year, a study found that those who entered into romantic relationships were less likely to be depressed compared to those who did not enter relationships.
Modern Scientist
A modern scientist engages in systematic study and builds knowledge through research, experimentation, observation, and methodological analysis in fields such as biology, chemistry, physics, and beyond.
Conservation of Mass
A fundamental principle of classical physics that states mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.
Chemical Reaction
A process that involves the transformation of one or more substances into one or more different substances through the breaking and forming of chemical bonds.
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