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1 First of all, the food you prepared is contaminated by fungi, and there are "seeds" for reproduction

2 The reproduction of fungi is Environmental requirements,

such as oxygen environment or oxygen-isolating environment, temperature and humidity and nutrient ratio, etc.,

When the environment where you place food reaches the growth requirements of this type of fungi, When the standards are suitable,

the fungi reproduce very quickly.

This is how bacteria are cultivated in the laboratory.

You accidentally cultivated fungi

Solution: It is impossible to completely isolate bacteria.< /p>

Generally, ensuring a low temperature + dry environment can prevent the rapid reproduction of most common bacteria.

Remember to throw away hairy food. Eating it can be very harmful to your health, such as causing cancer.