A. More soil must accumulate.
B. The ground must be covered with grass.
C. Smaller plants must die now.
D. Ferns must take root.
Đáp án là A.
Dựa vào ý: Roots broke even deeper into the developing soil. These grow rapidly, cutting off sunlight from the smaller plants, and soon establish complete domination - closing their ranks and forming a climax community which may endure for thousands of years
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