Question

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which challenges do countries face in limiting the spread of communicable diseases? lack of available healthy food increase of worldwide travel decrease of available clean water increase in migration of infected animals

Explanation:

Lack of healthy food mainly affects nutrition - not directly disease spread. Decrease in clean water impacts general health but not as directly as travel. Increase in infected - animal migration can spread diseases, but worldwide travel exposes more people to different communicable diseases across regions, facilitating their spread on a large scale.

Answer:

B. increase of worldwide travel