Bacteria that convert milk into curd play two other beneficial roles. What are they?

Explanation

**Step-by-Step Solution:**

1. **Identify the Bacteria**: The bacteria responsible for converting milk into curd are known as Lactic Acid Bacteria (LAB).

2. **Process of Conversion**: These bacteria multiply at suitable temperatures and produce lactic acid, which coagulates and partially digests the milk proteins, transforming milk into curd.

3. **First Beneficial Role**: One of the beneficial roles of Lactic Acid Bacteria is that they improve the nutritional quality of milk. They do this by increasing the content of Vitamin B12 in the milk.

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