That vs. Which
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Wine that is imported from France is expensive.
Is all wine expensive? No, just wine imported from France (as far as this sentence is concerned). Therefore, that is the best choice to maintain the integrity of the sentence. If we take out the word that and replace it with which, the whole meaning of the sentence is changed. Check it out:
Wine, which is imported from France, is expensive.
Plants, which generate energy through photosynthesis, need a certain amount of sunlight to survive.