Biology Instinct

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Term Paper Title	Biology Instinct
# of Words	441
# of Pages (250 words per page double spaced)	1.76

Biology Instinct

Insects are neumerout
invertebrate animals that belong in the Phylum
Arthropoda and Class Insecta.
The class Insecta is divided into 2 subclasses:
Apterygota, or wingless
insects, and Pterygota, or winged insects. Subclass
Pterygota is futher divided
on basis of metamorphosis. Insects that have
undergone incomplete metamorphosis
are the Exopterygota. Insects that undergo
complete metamorphosis are the
Endopterygota.

Insects have an outer bilateral exoskeleton to which the
muscles are attached
to and provides protection for internal organs. The
body is divided into 3
main parts which are the head, which include mouthparts,
eyes, and antennae;
thorax, which operate the jointed legs and /or wings;
and abdomen, which has
organs for digested food, reproducing, and getting
rid of waste products.

The major systems in insects are the circulatory,
respiratory, nervous,
muscular, digestive, and reproductive systems. In the
circulatory system,
blood is pumped by the heart in a tube to the aorta,
the head, and to other
organs then enters the ostia openings along the sides
of the tube back to the
heart. The respiratory systems carries O2 to cells
and takes away CO2 from
cells through branching out to call cells of body.
The nervous system consists
of a brain receiving information from eyes, antennae,
and controls the whole
body and 2 nerve cords containing ganglia fused together
to control activities
o...

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