Introduction
When one thinks of earthworms usually one thinks about slimy and nasty creatures that are only used for fishing. Wrong! If there were no worms on earth, farms and many plants could not be properly maintained. This paper will explain how important earthworms are to the earth and to our environment. In addition, this paper will cover the origin of an earthworm, the anatomy and other important characteristics. Origin The origin of earthworms were said to be on earth around 200 millions ago. Their ancestors were marine worms, existing before there was even soil on this planet and vegetation. These worms underwent a slow process of adapting themselves to a new environment. If worms were on earth, they would have been wiped out due to the ice age. The early European settlers brought them back to North America during the 17th and 18th centuries. Many famous scientists studied earthworms such as Aristotle and Charles Darwin. Aristotle called earthworms "bowels of the earth".
Characteristics Many people do not know how earthworms get around without features that other animals have. For example, earthworms have no eyes to see where they are going underground. They use the lights and vibrations from the ground to direct them on where they are going. Their skin is very sensitive to touch and chemicals of any kind. In addition, worms have sense organs that work like their noses. They are located in the front of the worms head. Earthworms obtain their food very differently and eat lots of nutrients. For example, they do not have any teeth so earthworms use their mouth muscles in order to obtain food. At night, the earthworms come to the surface to take fallen leaves and grass clippings into their burrow to eat. Most the time, night crawlers eat soil while traveling through it and gain all their nutrients. They also use soil to help digest their food. Some earthworms are able to eat