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 1. Perhaps the single most important action needed to greatly slow down the development and spread of antibiotic-resistant infections is to change the way antibiotics are used. Ending even some of the inappropriate and unnecessary use of antibiotics will help greatly in slowing down the spread of resistant bacteria. 2. Patients not finishing the entire antibiotic course. Overuse of antibiotics in livestock and fish farming. Poor infection control in health care settings. Poor hygiene and sanitation.  3.Even if new medicines are developed, without behaviour change, antibiotic resistance will remain a major threat. Behaviour changes must also include actions to reduce the spread of infections through vaccination, hand washing, practising safer sex, and good food hygiene.

Explanation:

the answer is b.) hydrogen bonds between bases.