Dolphins are mammals in the order Cetacea. They are part of the toothed whales. Generally, they are among the smaller whales. Most dolphins are oceanic dolphins (they live in live in salt water oceans). Other dolphins are river dolphins (they live in rivers). Dolphins are from 1.5 to 4 metres (4 ft 10 in to 13 ft 1 in) long.
Jellyfish are animals of the phylum Cnidaria. Most of them live in the oceans, in salt water, where they eat small sea animals like plankton and little fish, and float in the sea. Only a few jellyfish live in fresh water.They have soft bodies and long, stinging, venomous tentacles that they use to catch their prey, usually small plankton animals or small crustaceans or tiny fish
source : wikipedia
All live in the ocean, on the sea floor. Some live in deep water, others in shallow water. Some live in the intertidal zone, between low and high tide.They have five or more arms and can be quite large. The Sunflower sea star (Pycnopodia helianthoides) is the largest: fully grown, its arm-span is about a metre.
source : wikipedia
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