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The phylum Platyhelminthes exhibits bilateral symmetry and is composed of three germ layers.

1. The described features pertain to the phylum Porifera.
2. Organisms in Ctenophora, Cephalochordata, and Echinodermata are found only in marine environments.
3. Gorgonia (sea fan) is classified as an animal, and all animals lack a cell wall.
4. The phylum Platyhelminthes exhibits bilateral symmetry and is composed of three germ layers.

Correct answer: The phylum Platyhelminthes exhibits bilateral symmetry and is composed of three germ layers.

Solution

Platyhelminthes are bilaterally symmetrical and triploblastic, meaning their body can be divided into two equal halves along one plane, and they have three germ layers (ectoderm, mesoderm, and endoderm).

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