Write the scientific names of microbes which are used in the production of citric acid and butyric acid.

Explanation

To answer the question regarding the scientific names of microbes used in the production of citric acid and butyric acid, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Microbe for Citric Acid Production**:
- The first microbe that is commonly used for the production of citric acid is **Aspergillus niger**. This organism is a type of fungus that plays a crucial role in the fermentation process to produce citric acid.

2. **Identify the Microbe for Butyric Acid Production**:
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