Which structures in a male produce fluids that mix with sperm to form semen?

Explanation

To answer the question about which structures in a male produce fluids that mix with sperm to form semen, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Semen**: Semen is composed of sperm and seminal plasma. The seminal plasma is the fluid part of semen that contains various secretions.

2. **Recognize Male Accessory Glands**: The male reproductive system has several accessory glands that contribute to the formation of seminal plasma. These glands include:
- Seminal vesicles
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