The best answer is B. The river flooded yearly which allowed the fertile sediment on the bottom of the river to flow onto the farmland, keeping it fertile.
Answer:
Next time put the problem IN your question
Answer:
False
Explanation:
A biogeochemical cycle is the flux of chemical elements between biotic and abiotic zones of the Earth, many alements such as calcium, nitrogen, etc go through this cycles due to their conservation propierties. <em>A reservoir is when these elements are held during long period in </em><u><em>one place </em></u><em>like carbon forming coal.</em>
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