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Book lungs occur in...

Book lungs occur in

A

Earthworm

B

Insects

C

Arachnids

D

Mammals.

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks where book lungs occur. Book lungs are specialized respiratory structures. 2. **Identifying the Options**: The options provided are: - Option 1: Earthworm - Option 2: Insect - Option 3: Arachnid - Option 4: Mammal 3. **Analyzing Each Option**: - **Earthworm**: Earthworms respire through their skin via cutaneous respiration. Therefore, this option is incorrect. - **Insect**: Insects primarily use a tracheal system for respiration, not book lungs. Thus, this option is also incorrect. - **Arachnid**: Arachnids, such as spiders, possess book lungs as a means of respiration. This is the correct option. - **Mammal**: Mammals breathe using lungs, not book lungs. Hence, this option is incorrect. 4. **Conclusion**: Based on the analysis, the correct answer is Option 3: Arachnid, as book lungs are found in this group of organisms. **Final Answer**: Book lungs occur in arachnids. ---
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