Many forested regions of today were once barren rock areas. Mot likely this change involved the following sequence of stages:

A. Lichens-mosses-annual herbs-wood shrubsCorrect Answer
B. Annual herb-weedy shrubs-lichens-mosses
C. Woody shrubs-mosses-lichens-annual herbs
D. Mosses-annual herbs-woody shrubs-lichens
Correct Option: A. Lichens-mosses-annual herbs-wood shrubs

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