The answer is A.
the researchers would not be able to compare the samples and cut the DNA when samples from the waterway are not collected.
True I think but I’m not positive
Answer:
over time the antibiotic will become less effective against bacteria.
Explanation:
A new antibiotic can kill a greater percentage of bacteria because very less bacteria is resistant towards that antibiotic but when that antibiotic is used continuously for a long time then some bacteria develop resistance against that antibiotic and due to natural selection these bacteria are selected.
So if a particular antibiotic kills 99% of a bacterial population so the continuous use of this antibiotic will allow some bacteria to evolve resistance against it. Then these resistant bacteria will be selected by natural selection and over time the antibiotic will become less effective against bacteria.
