Questions 37-40 Complete the summary below.
Choose ONE WORD ONLY from the text for each answer. Write your answers in boxes 37-40 on your answer sheet.
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اسلاید 02
Bringing back an old concept
From 1,000 BC Chinese rice farmers made use of aquaponics, which helped them to increase their …37…They allowed fish into the rice paddies and the …38… from the fish naturally enriched their crops. Edenworks is looking at ways to incorporate that idea, but with a system that is not connected to the …39… They are trying to find a way to produce food that tastes great by duplicating the qualities of …40… found in nature.