the angle between a and b bar if a bar and a bar and b bar are the adjacent sides of parallelogram drawn from a common point and the area of the parallelogram is a b by 2
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Because of its water, Earth is home to millions of species of plants and animals. The things that live on Earth have changed its surface greatly. For example, early cyanobacteria changed the air and gave it oxygen. The living part of Earth's surface is called the "biosphere".
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