Examlex
What is the basic unit of pulmonary structure and function called?
Internal Validity
pertains to the extent to which a study or experiment accurately establishes a causal relationship between variables, minimizing the influence of external factors.
Systematic Changes
Alterations that follow a consistent, predictable pattern and are often due to specific causes or interventions.
Time
The indefinite continued progress of existence and events in the past, present, and future regarded as a whole.
History Effects
Events that occur outside the experiment which may affect participants' responses within the experiment.
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