Why did this industry attract the attention of planners and policy makers

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?