Spores ensure that a small portion of the fungus' protoplasm is widely and efficiently dispersed away from the site currently occupied by the organism.
Why might this be important?
Since fungi are non-motile organisms (with the exception of zoospores), if the site or substrate currently occupied by the fungus is becoming unfavourable for continued growth (e.g. it's becoming exhausted of nutrients) the fungus needs to produce propagules that can be widely and efficiently dispersed by air, water or animals to fresh sites or new potential hosts where there is a plentiful supply of nutrients.
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