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Sea Star is...

Sea Star is

A

Asterias

B

Ophiothrix

C

Antedon

D

Echinus.

Text Solution

AI Generated Solution

The correct Answer is:
To determine which organism is a sea star from the given options, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Options**: The options provided are Asterias, Ophiothryx, Antedon, and Echinus. All of these belong to the phylum Echinodermata. 2. **Analyze Asterias**: Asterias is commonly known as the sea star or starfish. It is characterized by its star-like shape, typically having five arms. This structure is a key feature of sea stars. 3. **Examine Ophiothryx**: Ophiothryx is known as a brittle star. While it also has five arms, it is distinct from sea stars in structure and behavior. Brittle stars have a more fragile appearance and can easily lose their arms. 4. **Look at Antedon**: Antedon is referred to as a feather star. Its arms have a feathery appearance and are bifurcated, giving the illusion of having more than five arms. This is different from the typical structure of a sea star. 5. **Consider Echinus**: Echinus is known as a sea urchin. It has a rounded shape covered in spines, which is quite different from the flat, star-like shape of a sea star. 6. **Conclusion**: Based on the characteristics analyzed, Asterias is the only organism that fits the description of a sea star. Therefore, the correct answer is Asterias. ### Final Answer: **Asterias** is the organism that is commonly known as a sea star. ---
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