Why does milk turn sour

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Why does milk turn sour da Mind Map: Why does milk turn sour

1. How does Bacteria get there?

2. What can we do to stop it?

2.1. What stops bacteria from growing?

2.1.1. Will bacteria grow in air tight conditions?

2.1.2. Does adding salt or sugar stop bacteria from growing?

3. What are the conditions for it to turn sour?