Expert answer:when conducting scientific research, the…….of

  

Solved by a verified expert:4-when conducting scientific research, the…….of a measure refers to whether it really measures what researchers think it measures.-reliability-validity-correlation-sample5-when looking at growth in a human embryo, the head develops before the rest of the body. Such growth from the head to the base of the spine illustrated the ……principle.-cephalocaudal-proximodistal-vernix-cerebral

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