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Which of these would be evidence that cyanobacteria evolved the ability to perform photosynthesis on earth over 2 billion years ago? A) A decrease in glucose in cellular fossils more recent than 2 billion years ago B) An increase in oxygen gas in the atmosphere and oceans starting 2 billion years ago C) An increase in carbon dioxide levels in the atmosphere and soils from 2 billion years ago D) The presence of eukaryotic cellular structures trapped in ice from earlier than 2 billion years ago

Respuesta :

Diatonic254

Answer:

B

Explanation:

When earth evolved photosynthetic organism 2 billions of years ago, they took in carbon dioxide from the atmosphere for photosynthesis and evolved oxygen. They are responsible for the great oxygenation event which also led to the death of may anaerobic species.  The rocks on the earth crust surface also became oxidized.

sebfernandez0917

Answer:

b

i just did it :))

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