What are the factors that cause food spoilage?

Explanation

**Step-by-Step Solution:**

1. **Micro-organisms**: The first major factor that causes food spoilage is micro-organisms such as bacteria and fungi. These tiny organisms can grow on food, especially when it is left at room temperature for extended periods. They break down the food and lead to spoilage.

2. **Enzymes**: The second factor is the natural enzymes present in the food itself. These enzymes can cause chemical reactions that lead to the deterioration of food quality over time. For instance, enzymes can cause fruits to ripen and eventually rot.

3. **Environmental Factors**: Other environmental factors that can contribute to food spoilage include exposure to air and light. Oxygen in the air can cause oxidation, which can spoil food. Similarly, light can degrade certain nutrients and lead to spoilage.

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