Chapter I

Important characteristics of earthworms

1. Biology

11 important characteristics of earthworms

In terms of historical background, earthworms come to about 600 million years ago and since then we have witnessed the evolution of plant and animal species. Appearance of this species during this period of little change between different species are not found and now also turned to a considerable difference of opinion.

These precious creatures, for several million years the Earth's surface area in comfort and silence, and the way you and have played an important role in nutrient cycling and the favorable conditions for better growth of plants have developed.

They are crisp and cylindrical body shape. Frame into the general body cavity of earthworms to continue. Number of rings varies by species. With increasing age, greater number of rings.

Each cycle of the worm body contains a series of annular muscle that opens and closes, the displacement of the worm. Of course this ring muscles, longitudinal muscles too.

The narrower end of the cylindrical body Janvryst earthworm ventral surface is relatively flat and low Rngtr the dorsal surface is darker, this creature lacks a clear head and a number of different species have different body parts in each and every one of the two clauses are separated by transverse grooves.

Mouth in the first paragraph (I) is and has been building and meat is no rigid appendage mouth in four different forms of earthworms denominator is that each has a specific name at the end of the body is located. (Fig. 1)

Nfrydyvpvr [1] or excretory orifice in the ventral lateral surface of the body on both sides and in all clauses except clauses III-I is secreted calcareous glands are at the end of the pore.

[1]. Nephridiopore

Figure (1) The outer structure of earthworms

Size of 111

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