How many organism are releated with Echinodermata phylum
Star fish, Sea-urchin, Sea-lily, Sea-mouse, Sea-hare, Sea-cucumber, Brittle star, Sea-potato, Sea-squirt, Sea-fan, Sea-pen

Options

A. 4
B. 5
C. 6
D. 7

Answer

To determine how many organisms are related to the Echinodermata phylum from the given list, we will analyze each organism one by one.

### Step-by-Step Solution:

1. **Identify the Organisms**: The organisms listed are:
- Starfish
- Sea-urchin
- Sea-lily
- Sea-mouse
- Sea-hare
- Sea-cucumber
- Brittle star
- Sea-potato
- Sea-squirt
- Sea-fan
- Sea-pen

2. **Classify Each Organism**:
- **Starfish**: Belongs to Echinodermata.
- **Sea-urchin**: Belongs to Echinodermata.
- **Sea-lily**: Belongs to Echinodermata.
- **Sea-mouse**: Belongs to Annelida (not Echinodermata).
- **Sea-hare**: Belongs to Mollusca (not Echinodermata).
- **Sea-cucumber**: Belongs to Echinodermata.
- **Brittle star**: Belongs to Echinodermata.
- **Sea-potato**: Belongs to Echinodermata.
- **Sea-squirt**: Belongs to Chordata (not Echinodermata).
- **Sea-fan**: Belongs to Cnidaria (not Echinodermata).
- **Sea-pen**: Belongs to Cnidaria (not Echinodermata).

3. **Count the Echinodermata Organisms**:
- From the classification:
- Starfish: Echinodermata
- Sea-urchin: Echinodermata
- Sea-lily: Echinodermata
- Sea-cucumber: Echinodermata
- Brittle star: Echinodermata
- Sea-potato: Echinodermata
- Total Echinodermata organisms = 6.

4. **Evaluate the Options**:
- Option 1: 4 (Incorrect)
- Option 2: 5 (Incorrect)
- Option 3: 6 (Correct)
- Option 4: 7 (Incorrect)

### Conclusion:
The correct answer is that there are **6 organisms** related to the Echinodermata phylum from the given list.

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