The joints of the human skeletal system
a. keep us upright.
b. hold bones in place.
c. allow for flexible movement.
d. have fluids that fight disease.

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Along what geographical feature are most of the oil producing regions located