How is it that mold appeared on my samples? (in other words where did it come from or what is the source of the mold that grows on the samples?) I had 10 bags each bag had 3 slices of apple and 3 pieces of bread, 5 bags where left in a dark warm place and 5 where left in a bright warm place. 2 bags were control bags, 2 contained the fruit/bread and 1 tsp of vinegar, 2 contained fruit/bread and 1 tsp of water, 2 contained fruit/bread and 1 tsp of lemon juice, and 2 contained fruit/bread and 1 tsp of sugar water. The fruit and bread were mixed together in the same bag.

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Nutrient Growth Medium

It is a culture medium or nutrient broth for all kinds of microorganisms to grow properly and create their colony. This matrix provides support to increase the population of microbes through the method of cell proliferation. It is regarded as the food material for those organisms. It is a type of in vitro mechanism, in which the development of life is processed outside the host body. It can be solid, semi-solid, or liquid in nature. Different kinds of cells develop in different types of media.