Name two commonly used bioreactors. State the importance of using a bioreactor.

Explanation

### Step-by-Step Solution:

1. **Definition of Bioreactor**:
A bioreactor is an apparatus or system in which living organisms, such as yeast, bacteria, or animal cells, are cultivated under controlled conditions to produce desired products.

2. **Commonly Used Bioreactors**:
- **Simple Stirred Tank Bioreactor**: This type of bioreactor uses mechanical stirring to mix the culture and maintain uniform conditions.
- **Spark Stirred Tank Bioreactor**: This bioreactor also utilizes stirring but may incorporate additional features to enhance mixing and aeration.
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