Earthworms have a beneficial effect on the physical and chemical properties of soil. Earthworms change the structure of the soil and improve water drainage. As earthworms dig through compacted soil, they ingest the soil and grind it up. They move organic

According to the lecturer and reading passage there are several positive points about earthworms and several negative points about earthworms. The lecturer explains that earthworms have many side effects on ecosystem. However, the reading contends that earthworms have many benefits on ecosystem.

The first point that the lecturer makes is that the warms lead to damage soil cover. According to the professor, there was a soil ecologist who noticed that there is a changing in the structure of soil surface near the shoreline, she made a test and noticed a large amount of earthworms. This point from the lecturer contrasts with the reading because the reading only says that Earthworms change the structure of the soil and improve water drainage.

Another point that the lecturer uses to cast doubt on the reading that the warms are taking the organic matters from the surface to down deeper. The lecturer claims that when the warms taking the organic matter from the surfaces so the duff will disappear, duff considered an important source of nutrition to the plants. However, the reading only states that the bodies of earthworms are rich in proteins, minerals, and vitamins, and when worms die these nutrients are released into the soil.

Finally, the professor stated that, on the contrary of the reading disappearing of duff will hurts many animals such as spiders, snails and beetles that depend on it. In other words the negative effects of warms will effects the ecosystem.
This contradicts the final idea of the reading passage because it only says that earthworms have positive force in the ecosystem