Earth worms in the animal world

       Earthworms   Earthworms are the animals in the animal world which have the elongated cylindrical body with pointed anterior ends but blunt posterior ends. They have metamerically segmented body i.e. whole the body is segmented in such a way that external segmentation is continuous with the internal segmentation and each segment is true and complete. Such segments are annules or rings. Earthworms are also the invertebrate animals without any back bone i.e. vertebral column. These animals use to live in the moist places of the earth and have elongated worm like body, so they are known as earthrorms.
Earthworms as the friends of farmers: Earthworms are the animals which contribute a lot to the farmers in being the animals which help them to make the soil loose and perforated. They also discharge their wastes inside the soil. wastes discharged by earthworms is very rich in organic substances and large amount of humus i.e. the very fertile part of soil enriched with decayed vegetable materials. Moreover , such soil is also very rich in oxygen content. Nitrogen fixing bacteria prefer to live in such type of soil which help to increase the fertility of soil a lot by fixing nitrogen in the soil.
Earthworms as the laboratory animals: Earthworms are very popular as the laboratory animals. They are among the cheap animals and easy to collect from the land. They are supplied in the laboratory to be used for scientific experiments. They are very helpful to be used for experiments in scientific research.
Use of earthworms in medical treatment:  Earthworms are used as the animals whcih are use din the medical treatment of several types of diseases. For example, they are used in the treatment of jaundice, bladder disease, plague etc. Poder prepared by dried earthworms is very useful in the treatment of malnutrition.