How many in the given examples of animals are Coelenterates,
Physalia, Obelia, Plannaria, Pennatula, Gorgonia, Pleurobrachia, Meandrina and Nereis.

Options

A. Three
B. Four
C. Five
D. Six

Answer

To determine how many of the given examples of animals are Coelenterates (also known as Cnidarians), we will analyze each animal listed in the question:

1. **Physalia**: This is a type of jellyfish and belongs to the phylum Cnidaria. Therefore, it is a Coelenterate.

2. **Obelia**: This is also a member of the phylum Cnidaria, making it another Coelenterate.

3. **Planaria**: This organism belongs to the phylum Platyhelminthes (flatworms), not Cnidaria. Thus, it is not a Coelenterate.

4. **Pennatula**: This is a type of sea pen and is classified under the phylum Cnidaria. Hence, it is a Coelenterate.

5. **Gorgonia**: This is a type of sea fan and also belongs to the phylum Cnidaria. Therefore, it is a Coelenterate.

6. **Pleurobrachia**: This organism is a type of comb jelly and belongs to the phylum Ctenophora, not Cnidaria. Thus, it is not a Coelenterate.

7. **Meandrina**: This is a type of coral and is classified under the phylum Cnidaria. Hence, it is a Coelenterate.

8. **Nereis**: This is a type of polychaete worm and belongs to the phylum Annelida, not Cnidaria. Therefore, it is not a Coelenterate.

Now, let's summarize the findings:

- Coelenterates (Cnidarians):
- Physalia
- Obelia
- Pennatula
- Gorgonia
- Meandrina

- Not Coelenterates:
- Planaria (Platyhelminthes)
- Pleurobrachia (Ctenophora)
- Nereis (Annelida)

Counting the Coelenterates, we find there are 5:

**Final Answer**: 5

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