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because like we do the flu they become immune to it and it doesnt affect them

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17y ago
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Q: Why would the chemicals used 50 years ago to kill insects not work any more?
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Related questions

What chemicals kill insects?

D.E.E.T . is the most common chemical.


Are chemicals intended to kill insects and other organisms that damage crops?

Yes, these chemicals are called pesticides.


Chemicals intended to kill insects and other organisms that damage crops are called?

PESTICIDES


What is a chemical intended to kill insects or other pests?

These chemicals are called insecticides.


How do we kill insects in your house?

We can use many insecticides or pest control chemicals to remove or kill insects in our house. We can also take help of any pest control service company for this purpose.


Which insects do farmers kill?

Well they try and kill the pest insects that damage their crops but unfortunately the insecticide sprays they use actually kill all insects which, while perhaps OK for the farmer is very bad for the ecology and biodiversity of the planet.....also we end up eating some of these chemicals and as they are poisons it can not really be good for us.


What pesticides are used to kill insect pests?

Pesticides are used to prevent, kill and repel pests. The pesticides used to kill insects are attractants, fumigants, insecticides, pheromones and repellents.


Which chemicals would kill fish if spilled in a river?

mercury


Do bees eat insects?

no. bees are vegeterien but they would attack and kill other insects in defence of the queen and the hive


Is pesticide used for killing insects?

Pesticides is the general term that's used to describe the chemicals that are designed to kill pests. The first part of the word, which is 'pest-' in this case, identifies the intended target or victim of the chemical. The second part of the word, '-icide', explains the intended, terminal action to whatever the pest is.There also are specific chemicals that kill specific pests. For example, 'fungicides' kill fungi. Chemicals identified as 'insecticides' kill insects. Those identified as 'miticides' kill mites. 'Herbicides' kill plants, usually weeds, 'rodenticides' kill rodents, etc.


What do you do to make a radioactive spider out of chemicals?

Radioactive chemicals would kill a real spider. Real life is not the same as the comics.


Why can't mammals be as small as insects?

Giving birth would certainly kill them.