Single/free-living :Amoeba
Colony/colonial :Eudorina
Filamentous/filament :Spirogyra
Part of living organism - cheek cell/onion cell
Secondary Succession-- Is a process started by an event. (Forest Fire, Harvesting, Hurricane.. etc.) that reduces and already established ecosystem.
I would say that the answer is
A.) The stages start with a Forest Fire.
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