Find out in the past if there were some biotic and abiotic factors in the ecosystems you have selected. But now they are not found. if this is the situation, find out the reasons for their diminition.
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According to my opinion the prime most reason is the pollution and the selfish behaviour and greed of human because of practice of non biodegradable thinks like plastic and over exploiting the use of fossil fuel (petroleum.etc) . Also we have seen that dodo bird and sparrow from the Delhi and many example like disbalance of weather due to increasing green house gases. and recently we have seen that Taj Mahal is getting yellowish ,hole in ozone later and the A QI index of Delhi got above 500
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