3. Select the response below that best describes the carbon cycle. a. The process by which plants and animals exchange gases.
b. The cycle in which the amount of carbon remains the same on earth as it is exchanged between living and non-living things.
c. A linear process in which fossil fuels burn to produce carbon dioxide.
d. Reservoirs of earth.

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Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.