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Saturday, April 13, 2013

Earthworm Lab Report

~General Information~ Worms atomic number 18 the most complex animals that I have studied. They argon classified into iii different phyla. at that place is a small number of species(20,000) of insects but there ar a large number of worms. All worms have three layers of cells. They also have true organs and organ dusts, and a complex anxious(p) system.

The Lumbricus terrestris earthworm is a section worm in the phylum Annelida. The earthworm is one of the most complex worms. Although segmented worms ar bilaterally symmetrical like other worms, they are different because the contain a coelom (inner space modify with fluid.) Since they have a coelom, they stomach be called a eucoelomate. These worms are also more developed.

The earthworm is one of the best know segmented worm. It has a dark dorsal surface, and a get out ventral surface. They also have an anterior end with a mouth and a small lip called the prostomium, and a later(a) end with an anus. On the skin of the worm there are bristles known as setae. Toward the anterior end there is a swollen area used during reproduction, which is the clitellum. An adult earthworm can have more than 100 segments.

Earthworms live in the soil, and they beat it as they move through it. While they make their manner through the soil they leave tunnels.

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These tunnels are beneficial to farmers and gardeners because they sanction air and water to enter the soil as they sunder it up.

The earthworm has several complex systems. These systems include a nervous system, digestive system, circulatory system, respiratory system, excretory system, and a fruitful system. The nervous system coordinates all movement and reactions that occur in the worm by carrying impulses over nerve pathways. The digestive system is responsible for taking in any food and getting...

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