Round off the following number to four significant figures.
273.15

273.2 since you only need 4 sig. figs. You round 5 to make 1 into 2

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"