Задание 39 ЕГЭ по английскому языку

Corals are sea animals that stay in one place during their lives. Corals can be very colourful underwater, but most types fade when they die or when they are removed from the water. Corals live in all the oceans of the world, in places where the water is warm. Some types live alone. Many types live together in groups called colonies. In fact, several different types of corals together can form really huge colonies. These colonies are called coral reefs. They look like plants. People have long used corals to make decorations. But this and other human activities have put many corals at risk. Rising ocean temperatures, oil spills and chemical pollution harm corals. Boats that float over reefs may also damage corals. People must do everything they can to protect them from extinction.