What are insects?
Insects are a large group of arthropods (segmented animals) that make up more than half of the biodiversity of animals on Earth. More than a million species have been described, with recent estimates of the total number of species in the range of up to 10 million. Only about a million non-insction animal species were described. Common insect types include dragon, prayer Mantis, Grasshopper, Butterfly, Moth, Fly, True Bugs, Beetles, Bees, Wasps and Ants. Insects existed since at least Devonian period, about 400 million years ago, when the first vascular plants appeared on land. Insects are primary terrestrial - their close relatives, crustaceans, are better adapted to the sea. They tend to be small, less than a few centimeters in size, in the range of up to 0.139 mm (0.00547 inches, fairy tales) and 55.5 cm (21.9 inches, insects). The largest known insect ever lived is Meganeura Monyi, prehistoric dragonfly related to the wing of more than 75 cm (2.5 feet).
Insects have three main parts of the body; Head, chest and abdomen. The head has folded eyes, sensory antennas and modified pendants that serve as oral rays. The abdomen contains most organs. Insects are missing both lungs and closed circulatory system. Oxygen replacement is carried out by trachea and direct diffusion with external. Insects 'blood' is called Hemolyf. Hemolyph distributes oxygen to organs simply by wash them rather than using blood vessels, as in mammals.
Insects have a variety of diet. Most of them are captivators, consume dead plants and animal material or HN. Others, like bees, survive from flower nectar. Some are insects and eat other insects. Others are parasites, some even have been able to throw the brains of other insects and control of their movements. Some insects have toxins that can deliver to prey through Stinger or even surface contact.
most insect types rarely interact if they mate orcompete for friends. However, some are especially social, such as wasps, bees and ants, all of which build nests or burrows. These species have "Queen" capable reproductions, while others serve as "workers" who defend the nest and collect food.