Respuesta :
Answer:
A.
Explanation:
The factors that affect soil formation are climate, rock type, slope, time, and biological activity. Differences in these factors will produce different types of soil. Soil type determines what can grow in a region. Humus, the decayed remains of living organisms, is essential for soils to be fertile.
B) is the answer because the decayed remains living organisms , is essential for soils to be fertile