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January 06, 1999
I. The first sub-topic
A. Distinctive Characteristics
1. Detail of the external anatomy
2. Detail of the sensory organs
B. Circulation and locomotion
1. Detail of the circulitary system
2. Detail of the respiratory system
II. The second sub-topic
A. Digestion, Venom, and Spider Silk
1. Detail of the digestive system
2. Details of venom and spider silk
Conclusion: Spiders are a very special unique and complexed Arachnids
January 06, 1999
The word spider came from an Old English verb spinnan. Spinnan means “to
spin.” People in Eroupe see spiders with distaste, in African and in American cultures
spiders are respected.
Spiders are the most abundant and distinctive of all earthly predators. Most of the
time they are not dangerous to us, spiders eat almost always insects and are found in
places from the Tundras all the way to the low forrests They play abig job in taking care
of the insect population, even the ones that can give us diseases.
Even though insects and spiders belong to the group called, Arthopoda, they look
so different from each other so they are put into different classes. The Insects and the
Arachnids. Scientists think that these two classes split up thousands of years ago.
Spiders come in different sizes, some of them are only 0.1 centimeter long,and
some of the are more than 4 inches long. They have two body parts and eight legs. The
spiders head and thorax are one body part. The thorax is the chest area of a spider. The
abdomen or the stomache is the second body part Each leg has seven sections, and on
the tips of many spiders legs are two tiny claws. Spiders that make a web use these claws
and their notched hairs, to walk on their webs without sticking to them.
Like insects, spiders have a body shell called an exoskeleton. This shell covers the
body and the legs and keeps the spider from drying out. Much like our skin is to us. And
to support the spider like our bones support us. Spiders even have a skelton inside called
the internal skeleton. This is where the muscles attach.
Unlike insects, spiders don’t have antennaes. They do have two ...
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