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A. Did anoxygenic or oxygenic phototrophs evolve first? B. Provide an evolutionary explanation for the colour...

A. Did anoxygenic or oxygenic phototrophs evolve first?

B. Provide an evolutionary explanation for the colour of land plants?

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Answer #1

A. In the evolution the primary enviournment was completely reached with Carbon dioxide.So to survive in that carbon dioxide rich enviournment the phototrophs were anoxygenic.

B. The evolution of the land plants is really a interesting thing,because in the primitive earth the plants were not found in the land,first they were present in the water, but not as a plant they were the algea,prtozoans and the cyanobacteria,which togetherly evolve and achive the green pigment the cholorophill and starts to grow on the land.

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