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41 votes
41 votes
The suggestion that C4 emerged ONLY 25-35 million years ago is pretty contentious! Why is there disagreement?

User Mabel
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1 Answer

18 votes
18 votes

Step-by-step explanation:

C4 plants adapted to the photorespiration problem by carrying out the Calvin cycle in their bundle sheath cells.

Does that solve you question.

User Sjoseph
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