Theoretically, insects are arthropods that possess specialized extremities and a body split into parts, covered in exoskeleton which can even develop into a shell. They also possess antennas, several extremities and in some cases, wings. They are mostly small, except the beetles that are of major size.
There are many various species. There are approximately 200 million of insects. Some of them feed of plants, others of meat or carrion. They play a very important role in nature, since they feed on other species, preventing them from turning into big plagues. A wonderful plant in the struggle against the plagues.
Insects and their similar ones take charge decomposing and eliminating an important percentage of the organic matter; being also the principal pollinizers of plants of ecological and economic importance.
We all know how we react when we see a spider or something else in our home. Their disagreeable appearance usually generates screams and sometimes even throwing shoes in the majority of the persons. We all respect nature, but we do not want spiders near our family, or a cockroach poking our food.