Известно, что a>0, b>0, c<0, d<0. Какой знак имеет выражение: а)abcd б) abd:c в) ac:bd г) a²b³c⁴•dв пятой

Прочитайте приведённый ниже текст. Преобразуйте, если необходимо, слова, напечатанные заглавными буквами в конце строк, обозначенных номерами 26–31, так чтобы они грамматически и лексически соответствовали содержанию текста. Заполните пропуски полученными словами. Каждый пропуск соответствует отдельному заданию из группы 26–31

Some call coral reefs the rain forests of the sea. In the past 20 years about 10 percent of coral reefs worldwide have become dysfunctional. Another 30 percent are 26____ stressed.SEVERE

Around the world, the story of coral reefs is a story of human actions causing dire consequences often long distances from the scene.

It is popular to say that we live on a small planet. Just how small can be seen in the Caribbean Sea, where the World's End Reef is in danger because mountainsides are eroding hundreds of miles away in Venezuela. In Florida, some yacht owners 27____ flush their toilets into port waters; many golf club 28____ dump onto the fairways tons of fertilizers, including a large percentage that will wash into the oceans. As a consequence, reefs suffer.CARE,MANAGE

Living coral reefs are composed of millions of tiny animals and plants that secrete a defense of calcium carbonate. When 29____, these stony structures are a 30____ sheltering habitat for fish, crabs, lobsters and thousands of other marine species. They also protect humans who live near the ocean from the stormy waves.HEALTH, NATURE

The sea shapes climate and weather, stabilizes temperatures, generates oxygen and provides more than 95 percent of the planet's living space. It is in our interest to stop 31____ harm to life in the seas. DO