Why are the classification systems changing every now and then?

Explanation

### Step-by-Step Text Solution

1. **Understanding Classification Systems**: Classification systems are methods used by scientists to categorize and organize living organisms based on their similarities and differences. This helps in studying the diversity of life on Earth.

2. **Discovery of New Species**: Every day, scientists discover new organisms. This continuous discovery adds to the already vast number of known species, which is estimated to be in the millions.

3. **Emergence of New Characteristics**: As new species are discovered, they often exhibit unique characteristics or features that have not been previously studied. These new traits can challenge existing classification systems.

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