These are considered as living laboratories of evolution

Options

A. Andaman and Nicobar islands
B. Malayan Archipelago
C. Galapagos Islands
D. Maldives

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the identification of structures in insects' mouthparts that are similar across different species.

2. **Identifying the Structures**: The mouthparts of insects consist of several components, including the labrum, labium, mandibles, maxillae, and hypopharynx. These structures are present in various insects but are adapted for different feeding functions.

3. **Classifying the Organs**:
- **Analogous Organs**: These are organs that have different structures but perform similar functions. For example, the wings of birds and insects are analogous.
- **Homologous Organs**: These are organs that have similar structures but may serve different functions. The mouthparts of insects fit this description as they share a common structural framework but are adapted for different feeding strategies.
- **Vestigial Organs**: These are organs that were functional in the past but are no longer useful. An example is the human appendix.
- **Atavistic Organs**: These are organs that reappear after being absent for a long time in evolutionary history, such as the cervical fistula in humans.

4. **Conclusion**: Since the mouthparts of insects are structurally similar but serve different functions, they are classified as homologous organs. Therefore, the correct answer is option two: homologous organs.

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