According to the universal law of gravitation, every object attracts every other object in the universe. why can’t you feel the force of attraction between you and mars?
a. there is no force between you and mars.
b. your mass is too low.
c. mars is a larger planet than earth.
d. mars is a long distance away.

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.