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Uses of ferns are as follows:
1)It is used as ornamental plants 
2)used in cushions in Hawaii
3) used as food in new zealand
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I saw this in my old textbook.. hope it helps... 
1) medicine- the oil from ferns can keep the worm away in human body.
2) environment- it acts as a manure and benefits the soil.
3) food- it is eaten as a part of food and it is rich in carbohydrates..
All The Best!
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