Homework Help: science

Posted by gabie on Friday, May 18, 2007 at 4:52pm.

cyanobacteria,wich first appeared on earth over 3 billion yaers ago are?

a.austrolopithecines
b.prokaryotes
c.one of the organisms on land
d.descendents of primitive plants

http://en.wikipedia.org/wiki/Cyanobacteria
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