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Organisms belonging to the phyla Ctenophora, Cephalochordata, and Echinodermata are found only in marine environments.

1. The described traits are characteristic of the phylum Porifera.
2. Organisms in the phyla Ctenophora, Cephalochordata, and Echinodermata are exclusively marine.
3. Gorgonia (sea-fan) is an animal, and all animals lack a cell wall.
4. Platyhelminthes exhibit bilateral symmetry and are triploblastic.

Correct answer: Organisms in the phyla Ctenophora, Cephalochordata, and Echinodermata are exclusively marine.

Solution

The statement in option B is correct as members of Ctenophora, Cephalochordata, and Echinodermata are indeed exclusively marine organisms. Other options either describe unrelated phyla or general characteristics of animals.

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