Explanation

First-generation pesticides included:

• organic
• and inorganic molecules.

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Second-generation pesticides were insecticides including:

• Dichlorodiphenyltrichloroethane DDT,
• chlorinated hydrocarbon,
• carbamates
• and organophosphates.

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Third-generation pesticides are far superior to the lead arsenate and DDT that epitomize the two earlier generations.

These chemicals are called juvenile hormones which are made in two small glands in insects' heads. 

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ND11-12-2022