Explain how diseases such as common cold are transmitted through air.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Common Cold:**
- The common cold is primarily caused by viruses, with rhinoviruses being the most common culprits. It leads to symptoms such as a runny nose, sore throat, and sometimes fever.

2. **Infection Source:**
- An infected person, who is suffering from a common cold, can spread the virus to others. This usually happens when they cough or sneeze.

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