One of the most important factors in the rapid spread and dispersal of zoonotic diseases in the modern world is : a. increased demand for meat b. improved transportation including high-speed rail and air lines c. wind dispersal d. none of the above

a. increased demand for meat

Explanation:

Zoonotic diseases refers to those diseases that are transferred to human host from an animal carrier. Zoonotic diseases can be transmitted when a living host is bitten by an animal or insect, eats a contaminated food and more. Examples of zoonotic diseases are; rabies, bird flu, anthrax, ebola etc.

Among the causes of zoonotic diseases, one of the most significant factors in the rapid spread and dispersal of zoonotic diseases in this modern world is the increase in demand for meat. Considering that eating contaminated and infected food from an animal can transfer the disease, an increase in demand for meat is one factor to look into regarding why zoonotic diseases are proliferating.

substitution is the answer in this case