Crustaceans, spiders and insects are able to regenerate their

Options

A. Abdomen
B. Thorax
C. Head
D. Limbs

Answer

**Step-by-Step Solution:**

1. **Understanding Regeneration**: Regeneration is the process by which organisms can replace lost or damaged body parts. This is particularly common in certain groups of animals, including crustaceans, spiders, and insects.

2. **Identifying the Organisms**: The question specifies crustaceans, spiders, and insects. All of these belong to the phylum Arthropoda, which is known for its segmented body and jointed limbs.

3. **Analyzing the Options**: The options given are:
- A) Abdomen
- B) Thorax
- C) Head
- D) Limbs

4. **Evaluating Each Option**:
- **Abdomen**: While some organisms can regenerate parts of their abdomen, it is not the most common or notable regeneration in these arthropods.
- **Thorax**: The thorax is a central part of the body that typically does not regenerate well in these organisms.
- **Head**: Regeneration of the head is complex due to the presence of the nervous system and is not commonly observed in these species.
- **Limbs**: Crustaceans, spiders, and insects are well-known for their ability to regenerate limbs (legs). This is the most common form of regeneration in these organisms.

5. **Conclusion**: Based on the analysis, the correct answer is D) Limbs, as these are the body parts that crustaceans, spiders, and insects can regenerate most effectively.

**Final Answer**: D) Limbs

---