Awoman treated her home with a pesticide that kills spiders. the first application killed 78% of the spiders. two months later she applied the pesticide again, but it only killed 45% of the spiders. what would best explain the decrease in the effectiveness of the pesticide?

The spiders that survived the first pesticide spraying were resistant to the pesticide and when they reproduced most of their offsprings got the gene of pesticide resistance.

If the pesticide killed 78% at first and now kills only 45% dat means the effectiveness if the pesticide has reduced by 33%. This could happen only if the pesticide was left open or in non favourable condition

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