Answer:
Antibiotic resistance occurs when bacteria change in response to the use of these medicines. Bacteria, not humans or animals, become antibiotic-resistant. These bacteria may infect humans and animals, and the infections they cause are harder to treat than those caused by non-resistant bacteria.
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Explanation:
<span>He could design and perform a new controlled experiment to test the hypothesis.</span>
Based on the choices above, the choice that is appropriate or a way of answering as to what toxicology is the first choice which reads that medicine substance that has an adverse effect on living organisms. It is because toxicology is the study of science that concerns with effects, nature and as well as poison in which base on the chosen choice, it talks more about the substances' effects.