The term taiga refers to that ecosystem

The taiga is one of the world's largest terrestrial ecosystems. It is a great example of how nature strives through the harshest of weather conditions.  The taiga biome is the largest terrestrial biome.  It is located right below the tundra biome. The taiga biome is also known as coniferous forest or boreal forest. This biome typically has short, wet summers and long, cold winters.  

A,) cause a & b are equal & both gives 180°

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.