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Insects are successful animals as they

have various adaptations to conserve water thus enabling them to inhabit a

terrestrial environment.

They excrete uric acid which does not require water

for its elimination, from the Malpighian tubules.

Their exoskeleton is

covered by a thin layer of wax, making it waterproof.

Their spiracles are

guarded by valves, which close to reduce water loss from the tracheal system

when the insect is at rest.

Hairs at the spiracle have the same role.

Embryos

are enclosed in a relatively impermeable shell (cleidoic egg), allowing development

outside the body without loss of water.

They have diverse mouthparts allowing

them to feed on solid or liquid food, thus reduce competing for food.

Some

possess wings which are an asset both to escape predators and to find a mate or

new locations with bountiful resources.