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Chemical changes in water quality caused by surface water pollutants can adversely affect ecosystems at all levels. It affects the health of organisms at the bottom of the food chain and thus the food supply of organisms located at the top of the food chain. This impact also includes the normal state of wetlands, which can reduce the ability of wetlands to support and maintain healthy ecosystems as a whole, to control floodwaters, and to filter pollutants from stormwater.

Contaminated surface water can also have adverse effects on the health of animals and humans who drink or bathe in the water, as well as aquatic organisms, which digest the contaminated sediment along with it. A major problem with contaminated surface waters is that fish-like aquatic organisms accumulate and concentrate those contaminants in their bodies. When other animals or humans ingest these organisms, they absorb even more pollutants than if they were directly exposed to these sources.

Changes in water quality caused by surface water pollution can damage entire ecosystems. It affects the entire food chain by affecting the lower end of the food chain, and it also affects the health of the land, disrupting its ability to support ecosystems, control floods, and purify pollutants from stormwater. When animals and people drink or bathe in contaminated water, it affects their health if they swallow the contaminated sediment.

The main concern is that aquatic organisms in surface waters, such as fish, accumulate large amounts of harmful substances in their bodies, and when other animals and humans eat these aquatic organisms, they directly ingest large doses of toxic substances, which is much more than their direct exposure to the original source of pollution.

I'll try, ahem.

The negative impact of water surface pollutants on ecosystems at all levels leads to changes in water composition. This change affects the health of organisms in the lower food chains and, therefore, the availability of nutrients up the food chain, while also adversely affecting the health of the marshes, for example, by weakening the boglands' ability to support good ecosystems and controlling flooding, filtering run-offs from stormstorms. Contaminated water surfaces can adversely affect the health of animals and people, such as animals and people drinking that water, bathing with that water, and aquatic products eating contaminated sediment.

One of our biggest concerns about polluted water is aquatic animals like fish, which can concentrate pollutants in their bodies. If other animals eat these contaminated aquatic products, they absorb much more pollutants than if they were directly exposed to the source in the first place.

Well, hope it helps.

With Christmas just two weeks away, buying gifts is the first thing many people do. However, not many people went out to the mall to buy gifts this year. Now, with the help of the Internet, everyone can stay in the comfort of their homes and shop.

Online shopping is becoming increasingly popular for several reasons. Online ** is usually low, you don't have to queue in busy stores, and with just a few clicks of the mouse you can buy almost anything you can think of.

Computer trends are typically dominated by men, but this year women are expected to spend more online than men. Today's women seem to be more fascinated by the convenience of online shopping than ever before. This year, the average online spending for women at Christmas will rise to £240 (3,360 yuan), and slightly lower for men at £233, while the average person spending on the average high street will only be £197.

Today, 70% of Internet users, both men and women, buy their Christmas gifts online.

In the past, many people were reluctant to shop online. They were concerned about the security of entering their credit card details online and the reliability of the Internet, but as online shopping became more widespread, those concerns began to disappear. Forty-five percent of Internet users are still concerned about security, but this has not slowed down the rising number of online shoppers.

One of the victims of the booming online shopping is the British high street. Some shops may have a Christmas turnover of up to 60% of the annual turnover. A lot of companies are worried that they won't have enough customers to visit before Christmas.

So there are always a lot of special offers in these stores before Christmas.

Traditionally, most stores are after Christmas**, but this year's ** is earlier than usual in order to attract customers.

This version is good and not machine-translated.