Предмет: Английский язык, автор: Аноним

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Автор ответа: Аноним

(I). (IA)
six. time
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Предмет: Английский язык, автор: Wwormsh

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Most of the 5,000 species of sponges live in warm, shallow salt water near coastlines, although some are found at ocean depths of 8,500 m or more. A few species live in freshwater rivers, lakes, and streams. The colors, shapes, and sizes of sponges vary. Saltwater sponges are brilliant red, orange, yellow, or blue, while freshwater sponges are usually a dull brown or green. Some sponges have radial symmetry, but most are asymmetrical. Sponges can be smaller than a marble or larger than a compact car. Adult sponges live attached to one place unless they are washed away by strong waves or currents. Organisms that remain in one place during their lifetimes are called sessile. They often cohabit with other sponges in permanent groups called colonies. Early scientists classified sponges as plants because they didn’t move. As microscopes were improved, scientists observed that sponges couldn’t make their own food, so sponges were reclassified as animals.

Fossil evidence shows that sponges appeared on Earth about 600 million years ago. Because sponges have little in common with other animals, many scientists have concluded that sponges probably evolved separately from all other animals. Sponges living today have many of the same characteristics as their fossilized ancestors.

In their watery environments, sponges play many roles. They interact with many other animals such as worms, shrimp, snails, and sea stars. These animals live on, in, and under sponges. Sponges also are important as a food source for some snails, sea stars, and fish. Certain sponges contain photosynthetic bacteria and protists that provide oxygen and remove wastes for the sponge.

Only about 17 species of sponges are commercially important. Humans have long used the dried and cleaned bodies of some sponges for bathing and cleaning. Most sponges you see today are synthetic sponges or vegetable loofah sponges, but natural sea sponges still are available. Today scientists are finding other uses for sponges. Chemicals made by sponges are being tested and used to make drugs that fight disease-causing bacteria, fungi, and viruses. These chemicals also might be used to treat certain forms of arthritis.
1. Sponges inhabit only one type of water body.
2. Sponges living in oceans are brighter in colour.
3. Sponges are avoided contact with by other marine creatures.
4. Scientists still do not know what kingdom sponges belong to.
5. Sponges haven’t changed much for a very long time.
6. Sponges are gradually going extinct because of climate change.
7. The predominant number of sponge species yield economic profit.
8. Sponges are used in medicine.

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