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 Pollution is a threat to many species on Earth, but sometimes it can cause species to thrive. Such is the case with Pfiesteria piscicida. A one-celled creature called a dinoflagellate, Pfiesteria inhabits warm coastal areas and river mouths, especially along the eastern United States. Although scientists have found evidence of Pfiesteria in 3,000-year-old sea floor sediments and dinoflagellates are thought to be one of the oldest life forms on earth, few people took notice of Pfiesteria.

Lately, however, blooms – or huge, dense populations – of Pfiesteria are appearing in coastal waters, and in such large concentrations the dinoflagellates become ruthless killers. The blooms emit powerful toxins that weaken and entrap fish that swim into the area. The toxins eventually cause the fish to develop large bleeding sores through which the tiny creatures attack, feasting on blood and flesh. Often the damage is astounding. During a 1991 fish kill, which was blamed on Pfiesteria on North Carolina’s Neuse River, nearly one billion fish died and bulldozers had to be brought in to clear the remains from the river. Of course, such events can have a devastating effect on commercially important fish, but that is just one way that Pfiesteria causes problems. The toxins it emits affect human skin in much the same way as they affect fish skin. Additionally, fisherman and others who have spent time near Pfiesteria blooms report that the toxins seem to get into the air, where once inhaled they affect the nervous system, causing severe headaches, blurred vision, nausea, breathing difficulty, short-term memory loss and even cognitive impairment.

 For a while, it seemed that deadly Pfiesteria blooms were a threat only to North Carolina waters, but the problem seems to be spreading. More and more, conditions along the east coast seem to be favorable for Pfiesteria. Researchers suspect that pollutants such as animal waste from livestock operations, fertilizers washed from farmlands and waste water from mining operations have probably all combined to promote the growth of Pfiesteria in coastal waters.
Question:What were bulldozers used for in the Neuse River?

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I have never listened to jazz music before

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The 26^th Annual Meeting of the Asia-Pacific Parliamentary Forum (APPF) ______ in Hanoi, our beautiful and peaceful capital city, from January 18^th to 21^st, 2018

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Alike light waves , microwaves may be reflected and concentrated elements.

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Many hundred years ago , there were many villages and little towns in England.

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Could you ______ me a lift into town?

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Noisy as the hotel was, they stayed there.

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They didn’t have the right visas. They couldn’t legally re-enter Thailand.

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Bob was absent; he _____ sick again.

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Britain’s Prime Minister Theresa May was the first world leader ______ Trump at the White House after his inauguration last year.

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If we use robots instead of humans, many people may be out of work

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Vietnam reached the semi-finals of the AFC U23 Championship 2018 with a penalty shootout win _________ Iraq on Saturday, January 20^th , 2018.

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I think we’ve come in for a lot of _____ about the impatience of some shop assistants.

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No vehicle weighing over 3.5 tons is allowed on this bridge, according to traffic signs placed at both ends of the structure

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He opened the letter without ______ to read the address on the envelope.

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The Ministry of Education and training of Vietnam has declared a decree on the new educational program paving the way for foreign educational co-operation and investment.