Use the drop-down menus to identify the spheres to which each part belongs. A lake is part of the . The air that surrounds us is part of the . Glaciers and icebergs are part of the . The Rocky Mountains are part of the . A deer is part of the .

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Certification programs are offered by all of the following except

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