Written by Merel Dagher (PEACE Advisor)
Which of the following was responsible for initially creating an oxygen-rich environment?
a. cyanobacteria
b. fungi
c. algae
d. protists
e. bryophytes
a. cyanobacteria
b. fungi
c. algae
d. protists
e. bryophytes
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The correct answer is a. Thanks to the photosynthetic activity of cyanobacteria, the atmosphere eventually accumulated levels of oxygen (oxygen is a product of photosynthesis, along with sugar). Cyanobacteria also make up biofuels (not algae).