Ctenophores have similarities with members

Options

A. Porifera
B. Coelenterata
C. Arthropoda
D. Annelida.

Answer

**Step-by-Step Solution:**

1. **Identify the Organisms**: The question asks about the similarities between ctenophores and members of other phyla. The options given are Porifera, Coelenterata, Orthopoda, and Annelida.

2. **Classify the Phyla**:
- Porifera (sponges) and Coelenterata (cnidarians) are classified as lower invertebrates.
- Orthopoda (arthropods) and Annelida (segmented worms) are classified as higher non-chordates.

3. **Determine the Classification of Ctenophores**:
- Ctenophores belong to the group of lower invertebrates, similar to coelenterates. Thus, we can eliminate Orthopoda and Annelida from consideration.

4. **Compare Porifera and Coelenterata**:
- Porifera have a cellular level of organization and are asymmetrical.
- Coelenterata and Ctenophores have a tissue level of organization and exhibit radial or bi-radial symmetry.

5. **Identify Common Features**:
- Both Ctenophores and Coelenterates have a mesoglea, which is a jelly-like substance found between the ectoderm and endoderm. This feature is not present in Porifera.

6. **Conclusion**:
- Given the similarities in organization, symmetry, and the presence of mesoglea, the correct answer is that Ctenophores have similarities with members of Coelenterata.

**Final Answer**: Ctenophores have similarities with members of Coelenterata.

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