Rewrite the sentences in the passive. 1. Rainforests regulate the Earths

Rewrite the sentences in the passive. 1. Rainforests regulate the Earths weather. 2. Scientists have investigated only 2 percent of 250.000 known plant species for their possible medicinal value. 3. Environmentalists are constantly developing projects to ensure the survival of the ecosistem. 4. Governments and elected officials will need to pass tougher environmental laws. 5. The oil explorstion business nearly drove the Hawaiian monk seal to extinction. 6. Greenpeace was protecting the environment long before it became fashionable. 7. Whalers had hunted the blue whale almost to extinction.