Many scientists believe that the current period of global warming is related to increased levels of .
a. nitrogen in the earth's atmosphere.
b. radon being released from the earth's soil.
c. carbon dioxide in the earth's atmosphere.
d. hydrogen in the outermost layer of the earth's atmosphere.

Astate's representation in the u.s. senate is based on a) equal representation. b) the state's population. c) the state's electoral votes. d) the size of their major cities.this independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren cthis independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren commission (wc) b) federal election commission (fec) c) equal opportunity commission (eoc) d) securities and exchange commission (sec)