Leftover vegetables went bad in two days

Leftover vegetables went bad in two days. Lata says food spoils because air gets to it. Nikhil says air gets to biscuits in an open tin too, yet they last for months. What actually spoils the food?

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More disagreements in The Invisible Living World

Rani reads that microorganisms are what set milk into curd Teena has a cold, with a runny nose and a cough Pooja boils milk and leaves it covered on the table, saying it will not spoil now because One slice of bread has a green patch Two children drank from the same school tap