Question

which of these statements is true?
doctors have not yet come up with an antibiotic that can kill harmful bacteria.
antibiotics can no longer kill any harmful bacteria because of resistance.
antibiotics are completely effective at killing all harmful bacteria.
some bacteria can become resistant to some antibiotics.

Explanation:

• Analyze Option 1: Doctors are constantly researching and developing new antibiotics, so the statement "Doctors have not yet come up with an antibiotic that can kill harmful bacteria" is false.
• Analyze Option 2: Antibiotics do not become completely ineffective against all harmful bacteria; they may lose effectiveness against some due to resistance, but not all. So this statement is false.
• Analyze Option 3: Due to natural selection and overuse of antibiotics, some bacteria can develop resistance to certain antibiotics. This is a well - known concept in microbiology related to antibiotic resistance. So this statement is true.
• Analyze Option 4 (the blue - circled one): Antibiotics can still kill many harmful bacteria, just not all (due to resistance in some). Saying they "no longer kill any" is false.

Answer:

The true statement is "Some bacteria can become resistant to some antibiotics." (The option with the text "Some bacteria can become resistant to some antibiotics.")