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* Temperature- more heat may cause objects to decompose faster, where as freezing things usually causes them to take longer to decompose. * The enzymes in microbes function more quickly at higher temperatures and so allow for quicker microbial growth. Of course if things get too hot the microbes' enzymes will start to denature and growth will slow again, 40oC is a good temperature for many species. * Humidity - similar to the heat factor, but more about the effect that the moisture in the air has on the object that is decomposing. Usually the more humid it is, the faster something decomposes. * Microbes need water to grow so some water is essential. A high salt concentration could limit microbial growth by making water unavalible to the microbes, for example in salted fish. * Oxygen Avaliablity (If surrounded by water) -lack of oxygen will limit the species of microbes which can grow. Typically those microbes which can grow will grow more slowly if less oxygen is avalible as less ATP is generated per glucose molecue using anearobic resipation. Anearobic repiration can produce acids which will limit the growth of many microbes just like pickling food!

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