Discuss how classification systems have undergone several changes over a period of time.

Explanation

### Step-by-Step Text Solution:

1. **Introduction to Classification Systems**:
- Classification systems are essential for organizing and categorizing the vast diversity of life on Earth. Over time, these systems have evolved significantly to accommodate new scientific discoveries and understandings.

2. **Aristotle's Classification**:
- The first known attempt at classification was made by Aristotle, who categorized living organisms into two main groups: plants and animals. He further divided plants into three categories: herbs, shrubs, and trees. Animals were classified based on the presence or absence of red blood cells (RBCs).
- **Limitation**: This system was simplistic and failed to account for the vast diversity of organisms, making it inadequate for comprehensive classification.
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