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Directions: An ecosystem includes soil, atmosphere, heat and Sight from the sun, water and living organisms. Soil is a critical part of an ecosystem. It provides important nutrients for the plants in an ecosystem. The atmosphere provides oxygen and carbon dioxide for the plants and animals. In a lake ecosystem, the sun hits the water and helps the algae grow. Algae produces oxygen for animals like fish and provides food for microscopic animals. All the living organisms get oxygen and carbon dioxide from?

A) Water cycle     

B)         Sun

C) Atmosphere    

D)         Algae