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Gorgonia, commonly known as sea-fan, is classified as an animal. Animals are characterized by the absence of a cell wall.

1. The described traits are representative of the phylum Porifera.
2. Organisms in Ctenophora, Cephalochordata, and Echinodermata are found only in marine environments.
3. Gorgonia, or sea-fan, is an animal, and animals do not possess a cell wall.
4. Platyhelminthes exhibit bilateral symmetry and are triploblastic.

Correct answer: Gorgonia, or sea-fan, is an animal, and animals do not possess a cell wall.

Solution

The correct choice is the one that directly combines the two given ideas: Gorgonia (sea-fan) is an animal, and animals lack a cell wall. The other options discuss unrelated phyla or traits.

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