Valid - GCSE Biology Definition

In GCSE Biology, the term 'valid' refers to how well an experiment or investigation accurately measures what it is supposed to measure. A valid investigation is one where the results truly reflect what is being tested, without being affected by other variables. To ensure validity, scientists control variables, use appropriate methods, and take clear, accurate measurements. This helps them draw reliable conclusions from their experiments. Validity is important because it ensures that the findings of a study are trustworthy and can be used to better understand biological concepts.