What is true about Nerels, Scorpion, Cockroach and Silver fish?

Options

A. None of them is aquatic
B. They all belong to the same phylum
C. They all have jointed paired appendages
D. They all possess dorsal heart

Answer

To determine what is true about Nereus, scorpion, cockroach, and silverfish, we can follow these steps:

### Step 1: Identify the Classification of Each Organism
- **Nereus**: This organism belongs to the phylum **Annelida**. Annelids are characterized by their segmented bodies.
- **Scorpion, Cockroach, Silverfish**: These organisms belong to the phylum **Arthropoda**. Arthropods are characterized by their jointed limbs and exoskeleton.

### Step 2: Define Invertebrates
- All four organisms (Nereus, scorpion, cockroach, and silverfish) are classified as **invertebrates**. Invertebrates are animals that lack a backbone or notochord throughout their life cycle. They also do not possess pharyngeal gill slits or a post-anal tail.

### Step 3: Identify Common Features
- A common feature among Nereus, scorpion, cockroach, and silverfish is the presence of a **dorsal heart**. This is a characteristic shared by these organisms, indicating a similarity in their circulatory system.

### Conclusion
- The true statement about Nereus, scorpion, cockroach, and silverfish is that they are all invertebrates and share the common feature of having a dorsal heart.

### Final Answer
- They are all invertebrates and possess a dorsal heart.

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