Which group of animals have estimated maximum species?

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Question**: The question asks which group of animals has the estimated maximum number of species.

2. **Understand Taxonomic Classification**: In the biological classification system, animals are categorized into various groups, with each group having a specific number of species.

3. **Focus on Class Insecta**: Among the various classes in the animal kingdom, Class Insecta is known for its vast diversity.

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