Cyanobacteria were some of the firstorganisms to appear on
Chapter 15, Problem 15.2.14(choose chapter or problem)
Cyanobacteria were some of the firstorganisms to appear on Earth. What isthe most significant way in which thesebacteria affected life on Earth?A They were a predator that preyed onorganisms that threatened to cause theextinction of other species.B They released oxygen throughphotosynthesis, which led to theformation of the ozone layer.C They were a primary food source forproducers.D They floated on water, shielding otherorganisms from the suns radiation.
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