Write A speech on your insects
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Insects are the largest group of animals on earth by far: about 926,400 different species have been described.[3] They are more than half of all known living species.[4][4][5][6][7] They may be over 90% of animal species on Earth.[8]
New species of insects are continually being found.[9] Estimates of the total number of species range from 2 million to 30 million.[3]
Insects have six legs; and most have wings. Insects were the first animals capable of flight. As they develop from eggs, insects undergo metamorphosis. Insects live all over the planet: almost all are terrestrial (live on land). Few insects live in the oceans or in very cold places, such as Antarctica. The most species live in tropical areas.
Some people call all insects "bugs", but this is not correct. Only some insects are true bugs, which is a particular order of insects. People who study insects are called entomologists.Different kinds of insects can be divided into groups called orders. There are many insect orders. The biggest insect orders are listed below:
Beetles (order Coleoptera) have the front pair of wings changed into a hard shell to protect the back wings.
Butterflies and moths (order Lepidoptera) have large, often colourful wings.
Flies (order Diptera) have only two wings.
Ants, bees, and wasps (order Hymenoptera) sometimes have stingers and sometimes live in large colonies (like ant hills).
True bugs (order Hemiptera) have a mouth that is long and narrow, like a drinking straw. This kind of mouth is called a beak.
Grasshoppers (order Orthoptera) can usually jump with their legs. Eat grass and grain plants.
Odonata, dragonflies and damselflies are top predators of other insects. Both aquatic nymphs and flying adults are carnivorous.
Phasmatodea, the stick and leaf insects, is an order which is entirely based on camouflage. It includes the world's longest insect, Chan's megastick.
Spiders, scorpions, and similar animals are not insects; they are arachnids. Arachnids are arthropods that have four pairs of legs. Centipedes are also arthropods, but not insects: they are in a subphylum called the Myriapoda.Pests can be harmful to people in different ways. Some are parasites, such as lice and bed bugs. Some of these parasite insects can spread diseases, such as mosquitoes spreading malaria.
Other pest insects do not directly hurt people. Termites and some beetles eat wood and sometimes eat buildings, such as houses. However, termites also help break down the trees and branches that fall on the forest floor. Many insects eat agricultural products (plants meant for people to eat). Grasshoppers are one example of pest insects that eat plants in agriculture.
Some insects are useful to us. Bees make honey. The larvae of some moths make silk, which people use to make clothing. In some parts of the world, people actually eat insects. Eating insects for food is called entomophagy.
Many bees and flies pollinate plants. This means the insects help the plants make seeds by moving pollen from one flower to another. Some good insects eat pest insects, such as lady beetles (or ladybirds or ladybugs) eating aphids. Many insects eat dead plants and animals.
Pesticides
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People often use poisons called insecticides to kill pest insects. Insecticides do not always work. Sometimes the pest insects become resistant to the insecticides, which means the insecticides do not hurt them anymore. Both the Colorado potato beetle and the diamondback moth are insects that are resistant to many insecticides.
Insecticides do not only kill pest insects; sometimes many helpful insects are killed too. When helpful insects are killed, such as those that eat pest insects, the pest insects may come back in larger numbers than before because they are not being eaten by helpful insects anymore.
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