Question

20 multiple choice 1 point which best explains why antibiotics lose their effectiveness over a period of years? antibiotics can kill bacteria only within the first few hours of illness. antibiotics break down very quickly when digested in the body. antibiotics are effective at killing some bacteria, but a few variants can survive and reproduce. antibiotics are effective at first but become weak before killing off harmful bacteria. clear my selection

Explanation:

Antibiotic - resistant bacteria emerge when a few variants survive antibiotic treatment and reproduce, passing on their resistance traits. Over time, this leads to a population of bacteria that are less affected by the antibiotic.

Answer:

Antibiotics are effective at killing some bacteria, but a few variants can survive and reproduce.