An experiment was conducted to investigate the effects of different types of music on the growth of plants. the four types of music -- rock, heavy metal, country, and classical -- were played. the growth of bean plants was then measured. in this experiment, the independent variable is:

hey,

i hope you are having a wonderful day

the correct answer is :

{b.}   ( american workers lose job opportunities )

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    -sprinkles

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; no longer than a reasonable period of time;

answer; motor learning;