China Traditional Culture and Biology

The relationship between organisms is very common: predation, competition, cooperation, parasitism and so on. "April Mountain Temple flowers will bloom" shows that the environment affects the growth and flowering of organisms, and the temperature drops by about 6℃ per 1 km above sea level, so the temperature on the mountain is lower than that on the mountain, and the peach blossoms on the mountain will bloom later than that on the mountain. Only in April will the flowers on the mountain bloom. More grass means more water and inorganic salts absorbed by grass; Grass also occupied the living space of bean seedlings, blocked the sunlight, affected the photosynthesis of bean seedlings, and led to the slow growth of bean seedlings, so there was a scene of "grass full of bean seedlings". The main function of decomposer is to decompose organic matter in animal and plant residues into inorganic matter and promote the material circulation in nature. Therefore, bacteria and fungi play a major role in the process of transforming fallen flowers into spring mud.

So choose: B.