Which of the following statements is true of the mass number of an atom?
A. The mass number of any atom can be found on the periodic table.
B.
The mass number of an atom always has the same value as its average atomic mass.
C.
The mass number of an atom is equal to the sum of its number of protons and neutrons.
D.
all of these

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?