Examlex
All of the following are human organ systems except ___________.
Economics
Economics is the social science that studies how individuals, governments, firms, and nations make choices on allocating scarce resources to satisfy their unlimited wants.
Experiments
Scientific procedures undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
Natural Experiments
Observational study setups where the variables of interest change naturally, allowing researchers to study outcomes without direct manipulation.
Laboratory Experiments
Controlled testing environments where researchers manipulate variables to study effects in a lab setting.
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