B
А
(a)
Identify the type of plants in which A and B could be found
A
B
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i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs