gilchris2394 gilchris2394
  • 16-01-2018
  • Biology
contestada

These are studies in which the same people are restudied and retested over a long period of time.

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ihaztenticles
ihaztenticles ihaztenticles
  • 16-01-2018
This is called longitudinal (sp?) studies. 

(I do not know if I spelled it right, sorry)
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