Are all fungi producers?

No. Fungi are decomposers.  A producer, makes its own food. A fungus does not make its own food, it breaks down nutrients from dead organisms to get a part of what it needs to survive. Which is why it is called a decomposer.

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primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

climate change and pollution