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Coral and Scyphzoans


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Coral and Scyphzoans

Postby purplec16 » Tue Feb 02, 2010 1:47 am

Coral reefs, atolls, and islands resultant of the buildup of coral: 1 polyps, 2medusae,3 exoskeleton,4 wastes What one of these causes? :? I think its wastes am i right..?

Which statement is true for scyphozoan medusae?
A.They are the dominant body form (I think it's this 1, am i right?)
B.They are generally smaller than hydrozoan medusae
C.Most livein fresh water
D.They are scavengers
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Postby firechild » Tue Feb 02, 2010 2:13 am

Firsd one is exoskeletons. It is the calcium carbonate skeleton that created coral reefs.

You are right with the second one. Mature scyphozoans are all medusae. Juveniles are, in most cases polyps but change at a very early stage to medusae.
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