Factors Contributing to the Success of Insects

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Factors Contributing to the Success of Insects Insect, small, air-breathing animal characterized by a segmented body with three main parts—head, thorax, and abdomen. In their adult forms, insects typically have three pairs of legs, one pair of antennae, and in most instances, two pairs of wings. Insects rank among the most successful animals on Earth. About one million species of insects have been identified so far, which is about half of all the animals known to science. That is why for every pound of human on the earth there are 10 pounds of insects. So that is why there are many reasons why insects are so successful, their exoskeleton, their size, their body function, the way they reproduce, and their development of metamorphosis. One of the first reason why insects are so successful because they possess a tough exoskeleton that is covered with a waxy water repellant layer. The exoskeleton of insects also has helped them survive. An insect's external skeleton, or exoskeleton, is made of semi-rigid plates and tubes. In insects, these plates are made of a plastic like material called chitin along with a tough protein. A waterproof wax covers the plates and prevents the insect's internal tissues from drying out. Insect exoskeletons are highly effective as a body framework, but they have two drawbacks: they cannot grow once they have formed, and like a suit of armor, they become too heavy to move when they reach a certain size. Insects overcome the first problem by periodically molting their exoskeleton and growing a larger one in its place. Insects have not evolved ways to solve the problem of increasing weight, and this is one of the reasons why insects are relatively small. But compared to animals the Exoskeletons d... ... middle of paper ... ...eding and locomotion. (flight allows dispersal almost world wide with time). Insects possess all types of legs for running, grabbing, digging, crawling, and clinging etc. They also possess wings. The ability to fly allows insects to disperse from a crowded and deteriorating habitat when necessary. For example, in Africa, populations of up to a billion locusts migrate annually from unsuitable dry areas to greener areas where rains are falling. In North America, Monarch butterflies will migrate to Mexico and coastal California to avoid harsh Canadian winters. Locally, ladybird beetles migrate to mountain tops during winter and summer. Seventh, in some groups of insects, truly social behavior has evolved. Social behavior will allow a large population to survive through difficult periods via cooperation in food gathering, food storage, temperature control, and colony

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