1. Ranking of biological preferences in the eyes of the earth:
1. Humans are at the bottom: In the ranking of the preferences of the earth, humans may be in a lower position.
2. Top 10 flies: Saprophytic flies, represented by houseflies, may make it to the top 10 because they play an important role in the ecosystem.
2. The role of flies in the ecosystem:
1. Cleaners: Scavengers such as flies are cleaners in the ecosystem, responsible for decomposing and disposing of garbage such as animal and plant carcasses and excrement.
2. Energy and material cycle: they treat waste harmlessly, degrade it into fertilizer, and complete the energy and material cycle of the ecosystem.
3. A link in the food chain: Maggots and flies are a food source for many other animals, which are highly nutritious and easily accessible.
3. Comparison between silkworms and flies:
1. Limitations of silkworms: As the only insect completely domesticated by humans, the existence of silkworms has no significant impact on other organisms and mainly serves the needs of humans.
2. The overall contribution of flies: Compared with silkworms, the dedication of flies is more comprehensive and selfless, and their existence and activities are of great significance to the balance and stability of the entire earth's ecosystem.