What is the two-kingdom system of classification?
Name the scientist who has given this system.

Explanation

### Step-by-Step Solution:

1. **Definition of the Two-Kingdom System**:
The two-kingdom system of classification is a method of categorizing all living organisms into two main groups or kingdoms. This system simplifies the classification of organisms by dividing them into two broad categories.

2. **The Two Kingdoms**:
In this system, all living organisms are classified into:
- **Kingdom Plantae**: This kingdom includes all plants.
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