JELLY, popularly but erroneously referred to as jellyfish, is a free-swimming invertebrate belonging to the phylum Cnidaria, which also includes marine animals such as SEA ANEMONES. Jellies are structurally primitive animals, possessing no circulatory or respiratory systems. They absorb oxygen from the water directly through cell tissue and move by pulsing their bodies. Their only sense organs are photo receptors, which respond to light. A single body opening leads to a central stomach; waste...

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