How have antibiotics changed the quality of life of for humans over the past century

Antibiotics have helped in a speedy recovery for human illnesses over the past century.

Explanation:

Because anti biotics were not present centuries ago, many would get sick and even die. However, antibiotics work by affecting things that bacterial cells have but human cells don't. This helps to fight off the bacterial cells and fight infections and viruses, leading to a speedy recovery.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."