The proposal of three domains of life is given by scientist __________.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Domains**: The question asks about the scientist who proposed the three domains of life. The three domains are a classification system that categorizes all living organisms based on their cellular structure and genetic makeup.

2. **Identifying the Three Domains**: The three domains of life are:
- **Archaea**: This domain includes organisms that are often extremophiles and have unique biochemistry.
- **Eubacteria**: This domain consists of true bacteria, which are more common and diverse.
- **Eukarya**: This domain includes all eukaryotic organisms, which have complex cells with a nucleus, including protists, fungi, plants, and animals.
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