In the description of the circulation of substances, the ascending part and the descending part are sometimes distinguished. Explain what you are talking about.
In the cycle, the movement of substances from the environment into living organisms (producers) and the absorption of solar energy by them is often called an ascending stream, and the destruction of organic substances to mineral substances (with the help of consumers and reducers) and the removal of substances and energy into the environment – a downdraft. Ecosystems persist and exist for a long time if there is a dynamic equilibrium of the upward and downward flows of the circulation of substances.
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