Who is the current president pro tempore of the senate? I’m talking about the USA

I need to know as soon as possible I’ll give 5 stars to the best answer

Suppose that sociologists and cultural anthropologists are tying to measure the amount of child abuse for cross cultural comparison. they run into disagreement over whether spanking a child is abuse or discipline. what problem are they encountering in their research? a. reliability of the definition of abuse. b. validity of the definition of abuse. c. occam's razor about the definition of abuse. d. none of these.