.
Hard soil
Bare rock
Dry lake bottom
Burned forest
Primary Succession
Secondary Succession
Pioneer species
Community organisms
Bacteria
10 years
100 years
1000 years
1 million years
Protists
Bacteria
Fungi
Lichen/Moss
Primary Succession
Secondary Succession
Glacier retreating
Flood
Volcanic eruption
Primary Succession
Secondary Succession
True
False
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