Câu hỏi của truongthao - Sinh học lớp 8

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Then the water caries disease .Farmers cannot use the water their land . Now scientist think that water hyacinth canbe useful. Some fish like to eat them . Farmers can grow these fish in the lakes and rivers . Workers can collect and cut the plant with machine . Then they can make fertilizer to make their crop grow better . They can also make food for their anlimals . Maybe it will be possiple to make methane gas (CH4) for energy .Then poor countries will not have to buy so much expensive petroleum.Maybe in the future people will love these  plants in stead of hating them


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