Emergence of infectious diseases can be attributed to all of the following EXCEPTGroup of answer choicesease of travel.climatic changes.new strains of previously known agents.None of the answers is correct; the emergence of infectious diseases can be attributed to all of these.antibiotic resistance.

The correct answer is "None of the answers is correct; the emergence of infectious diseases can be attributed to all of these." This is because all the options listed - ease of travel, climatic changes, new strains of previously known agents, and antibiotic resistance - are factors that can contribute to the emergence of infectious diseases.

1. Ease of travel: With the ease of global travel, infectious diseases can spread quickly from one part of the world to another.

2. Climatic changes: Changes in climate can create environments that are more conducive to the spread of certain diseases. For example, warmer temperatures can increase the population and range of mosquitoes, which can spread diseases like malaria and dengue fever.

3. New strains of previously known agents: Sometimes, new strains of diseases can emerge that are more virulent or resistant to existing treatments. For example, multiple strains of the influenza virus emerge each year.

4. Antibiotic resistance: Overuse and misuse of antibiotics can lead to bacteria developing resistance to them, making infections harder to treat.

Therefore, all of these factors can contribute to the emergence of infectious diseases.