A mass is measured as 6.2 kg in one experiment and as 6.20 kg in another. in what way do these measurements differ

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

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.