Name the 3 electron-carrier complexes present in ETS.

Explanation

To answer the question about the three electron-carrier complexes present in the Electron Transport Chain (ETS), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The Electron Transport Chain (ETS) is a series of complexes that facilitate the transfer of electrons derived from NADH and FADH2 to oxygen, ultimately producing ATP through oxidative phosphorylation.

2. **Identify the First Complex**: The first electron-carrier complex in the ETS is known as the **NADH dehydrogenase complex**. This complex is also referred to as **Complex I**.

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