A large amount of untreated sewage entered the river. Many fish died. Untreated sewage water contains organic matter and bacteria. Explain why many fish died.

Explanation:

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If untreated sewage gets into rivers, microorganisms decompose it. They use oxygen from the water for aerobic respiration. As a result there is less oxygen dissolved in water, so aquatic organisms such as fish and insects may be unable to survive.

Ten percent of energy is transferred from sun to the level indicated.

Calcinosis is the diagnostic term that means an abnormal buildup of calcium on the kneecap (patellar) surface. it is a term uses to describe a group of disorders in which calcium deposits form in the skin. it is also referred to the abnormal deposit of calcium phosphate.