Penetration resistance is referred to the reason why population of insects might survive being sprayed with pesticide.
These are substances usually in the form of chemical which are used to control pests such as insects, rodents etc and examples of such include the following below:
Some insects such as bees have a very thick outer cuticle which slows down the absorption of the chemicals into their bodies and prevents a high amount from entering into them.
This thereby makes it possible for them to survive being spayed and is the most appropriate choice.
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