A coherent group of principles and hypotheses that explain some aspect of an area of study is a(n) ____

a. valid measure
b. theory
c. correlation
d. operational definition

b

Psychology

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Sound waves are simply ___________

a) the vibration of the molecules of the air surrounding us b) the impact of acoustrons in the air c) a form of electronic radiation d) the result of emitted photons from a source

Psychology