Which of the following options have features corresponding to the given animals
Ophiura, Asterias, Antedon, Echinus

Options

A. Water vascular system, Calcareous shell
B. Water Canal system , Calcareous shell
C. Calcareous shell, acoelomate
D. Pseudocoelomate, Water vascular system

Answer

To solve the question regarding the features corresponding to the animals Ophiura, Asterias, Antedon, and Echinus, we will follow these steps:

### Step 1: Identify the Animals and Their Common Names
- Ophiura: Brittle star
- Asterias: Starfish
- Antedon: Sea lily
- Echinus: Sea urchin

### Step 2: Classify the Animals
All four animals belong to the phylum **Echinodermata**. This phylum is characterized by certain common features.

### Step 3: Understand Key Features of Echinoderms
1. **Calcareous Ossicles**: Echinoderms have a skeleton made of calcareous ossicles, which are small, bony structures that provide support and a spiny appearance.
2. **Water Vascular System**: They possess a unique water vascular system that aids in locomotion, feeding, and respiration.

### Step 4: Eliminate Incorrect Options
- **Calcareous Shell**: This term is incorrect for echinoderms; it is more applicable to mollusks. Echinoderms do not have a calcareous shell.
- **Coelomate**: Echinoderms are true coelomates, which means they have a true coelom (body cavity).

### Step 5: Determine the Correct Option
Based on the features discussed, the correct option must include:
- Presence of calcareous ossicles
- Presence of a water vascular system

From the analysis, we conclude that **Option 1** is the correct answer, as it aligns with the features of the animals listed.

### Final Answer
The correct option is **Option 1**.

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