Why are C4 plants able to photosynthesize with no apparent photorespiration?

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Question:
Why are C4 plants able to photosynthesize with no apparent photorespiration?

1.They do not participate in the Calvin cycle.

2. They use PEP carboxylase to initially fix CO2 .

3.They are adapted to cold, wet climates.

4.They conserve water more efficiently.

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