The striking dissimilarities in plant communities among different biomes that have the same average yearly amount of rainfall can be explained by the fact that

A) plant communities are influenced more by the acidity of rain than by the amount of rainfall.
B) plant communities evolve more slowly than changes in weather patterns.
C) temperature and rainfall interact to influence plant communities.
D) plant communities occur randomly, depending on where seeds are blown or carried.
E) plant communities are not influenced by rainfall.