Why might developing countries be more vulnerable to modern pandemics?

Because their system is so poor that unable them to past through a health crisis like that.

Explanation:

The main reason is because developing countries lack of efficiency in so many areas. The major part of their population don't have fair access to healthcare, education, decent jobs and they lack of goods to support their people. On the other hand, their science is not develop enough to innovate and offer to their society solutions to emergency problems.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

the word that best sums up the tone of the newspaper regarding the treaty of versailles is resentful.