You need a 450 micrograms sample of gold, but you only have a mass balance that measures in decigrams. Convert the amount of gold you need to decigrams by comparing the exponents. Provide

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.

It really doesn't matter for any of the questions that you've listed.