Describe zonation on a local and world-wide (global) scale. Include in your answer:
a. (global) a description of and the reasons for world-wide circulation of air and water masses,
b. (global) the reasons for tides
c. (local) the adaptations of animals that restrict them to certain tidal zones from the splash zone to near shore coastal waters,
d. (local) the influences of latitude, altitude and geographic position on plant communities across the North American continent.

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