Question

Both freshwater and marine water organisms are found in

Answer 1

Habitat of members of option a

• Members of the phylum Porifera includes sponges that are mostly marine (Sycon) but can also be present in freshwater (Spongilla) sometimes.
• Coelenterates (cnidarians) are aquatic, mainly marine (Adamsia) with few freshwater animals (Hydra) that contain cnidoblasts.
• Animals in the phylum Annelida have segments on their body and may be aquatic (marine and freshwater). For example, Nereis are marine, while Hirudinaria (blood sucking leech) inhabit freshwater.
• Molluscs are aquatic (marine or freshwater) animals whose body is encased in a calcareous shell. For example, gastropods (snails) are freshwater organisms, while Octopus (Devil’s fish) is marine
• Osteichthyes are a class of bony fishes that include both marine and freshwater fishes. For example, freshwater - Labeo (Rohu); marine - Hippocampus (Sea horse).