Who the #!$% is gibbs and why is he giving out free energy​

The fact that the total amount of energy in a system remains constant is a(n)

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.

How can the periodic table be used to predict the behavior of elements?