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Nereis has...

Nereis has

A

Stereoblastula

B

Discoblastula

C

Coeloblastula

D

Superficial blastula.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Organism**: The question refers to "Nereis," which is a genus of marine polychaete worms belonging to the phylum Annelida. 2. **Understand the Context**: The question is asking about the type of blastula that Nereis forms during its embryonic development. A blastula is an early stage of embryonic development that occurs after fertilization and several rounds of cell division. 3. **Define Blastula Types**: There are different types of blastulae, including: - Stereoblastula - Discoblastula - Celioblastula - Superficial blastula 4. **Relate to Nereis**: Nereis, being an annelid, forms a specific type of blastula. In annelids, the blastula is formed without a cavity, which is characteristic of a stereoblastula. 5. **Conclusion**: Therefore, the correct answer to the question "Nereis has" is **Stereoblastula**. ---
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