Ascientific theory is based on a) data collected over time. b) a general claim by scientist. c) the best guess of a scientist. d) an idea that can only be proven true.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere