Instead of a brain, jellyfish possess an elementary nervous system, or nerve net, which consists of receptors capable of detecting light, odor and other stimuli and coordinating appropriate responses.
Starfish, or sea stars (a less confusing designation, since they are only very distantly related to fish), are marine invertebrates belonging to the kingdom animalia, phylum Echinodermata, and class Asteroidea, of which there are over 1800 known species. The names sea star and starfish also are (incorrectly) used for the closely related brittle stars, which make up the class Ophiuroidea.
Even before Nemo became a household name clown fish were extremely popular. They are very beautiful and fun to watch. They quickly catch the eye and many marine enthusiasts enter the hobby because of an attraction to these colorful beauties.
Around the world and throughout history, sharks have inspired stories, art, traditions and rituals.
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