Psychology Animal research is a recent scientific invention.
Please select the best answer from the choices provided
OT
OF

a is the answer because it just is

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.

answer; the intervening variable;

answer' recieve unequal treatment as a group;