Which of the following matches a human action with its impact? Construction of dam : Purification of water
Use of pesticides : Contamination of drinking water
Decrease in honeybee population : Increase in plant population
Construction of roads : Improvement in quality of water in local lakes

The correct answer is B

Explanation:

The other two man made actions did not have negative impacts like they should and the only one that did was Answer B :)

"d.) carbon dioxide and hydrogen sulfide"

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )