Traveling southward from the arctic regions of canada to the tropics of panama, one passes through several biomes - tundra, coniferous forest, temperate deciduous forest, and tropical rain forest. this pattern of change in vegetation is primarily the result ofa. primary and secondary successionb. an increase in both mean annual temperature and mean annual precipitation c. an increase in the total annual hours of sunlightd. the invasion of exotic species

Explanation:

This pattern of change in vegetation is primarily the result of because an increase in both mean annual temperature and mean annual precipitation.The vegetation changes with changes in temperature from traveling  southward from the Arctic regions of Canada to the tropics of Panama, Temperature and the precipitation both increase which is better from vegetation growth.

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answer; gravity pulls glaciers down hill and as glaciers flow it pick up rocks and soil;