Which one feature is common to leech, cockroach and scorpion?

Options

A. Nephridia
B. Ventral nerve cord
C. Cephalization
D. Antennae

Answer

To determine which feature is common to leech, cockroach, and scorpion, let's analyze the options provided:

1. **Nephridia**:
- Nephridia are excretory organs found in annelids, such as leeches. They function similarly to kidneys by removing metabolic waste from the body.
- Cockroaches have Malpighian tubules for excretion, and scorpions possess green glands. Therefore, this feature is not common to all three.

2. **Ventral Nerve Cord**:
- The ventral nerve cord is a characteristic feature of the nervous system in many invertebrates, including leeches (annelids), cockroaches (arthropods), and scorpions (also arthropods).
- This feature is indeed common to all three organisms.

3. **Civilization with a Well-Developed Head**:
- Cockroaches and scorpions have a well-defined head, but leeches do not possess a distinct head structure. Thus, this feature is not common to all three.

4. **Antennae**:
- Antennae are sensory appendages found in arthropods, such as cockroaches and scorpions. However, leeches, which are annelids, do not have antennae. Hence, this feature is also not common to all three.

Based on the analysis of the options, the common feature among leech, cockroach, and scorpion is the **Ventral Nerve Cord**.

**Final Answer**: The common feature to leech, cockroach, and scorpion is the **Ventral Nerve Cord**.

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