A) lichen '! Moss '! Grass '! Shrub '! Tree
B) Tree '! Shrub '! Lichen '! Moss '! Grass
C) Moss '! Shrub '! Tree '! Lichen '! Grass
D) Lichens '! Tree '! Moss '! Grass '! Shrub
Correct Answer: A
Solution :[a] The change of plant and animal communities in an orderly, predictable sequence in an area is called ecological succession. The sequence of succession is lichen stage '! Moss stage '! Grass stage '! Shrub stage '! Tree stage.
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