Name the kingdom system proposed by R.H. Whittaker.

Explanation

**Step-by-Step Solution:**

1. **Identify the Classification System**: The question asks for the kingdom system proposed by R.H. Whittaker. The answer is the five kingdom classification system.

2. **Understanding the Five Kingdoms**: R.H. Whittaker's classification divides organisms into five kingdoms:
- **Monera**: This kingdom includes prokaryotic organisms, such as bacteria.
- **Protista**: This kingdom consists of mostly unicellular eukaryotic organisms.
- **Fungi**: This kingdom includes organisms that are heterotrophic and typically have a cell wall made of chitin.
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