Which animal is older? The jelly fish or the horseshoe crab?
by 
Phillis - Zacks little sister
ANSWERS: 5
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im guessing the jellyfish.:-)+
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I was going to say horseshoe crab, glad I checked. Here are two story headlines I found when searching. Fossil Record Reveals Elusive Jellyfish More Than 500 Million Years Old! Horseshoe crabs, common along the Delaware coast, have evolved little in the last 250 million years.
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Jellyfish. It is less complex therefore, must be older.
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I figure the Jellyfish These might help. Timeline of evolution http://en.wikipedia.org/wiki/Timeline_of_evolution Jellyfish http://en.wikipedia.org/wiki/Jelly_fish Horseshoe crab http://en.wikipedia.org/wiki/Horseshoe_crabs Apparently they can survive in the dead zones. Dead zone (ecology) http://en.wikipedia.org/wiki/Dead_zone_(ecology) Jellyfish “blooms” could be sign of ailing seas. http://www.eurocbc.org/page727.html Turritopsis nutricula: the world's only 'immortal' creature http://www.timesonline.co.uk/tol/news/science/article5594539.ece
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jellyfish= to come in contact with a jellyfish can be deadly for seagoing enities and a burning feeling to us, a horseshoe crab has too many enemies both underwater and out.
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