Its a test and im not good with the table really

Which statement is best described as a atom

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?