Final answer:
Cancer is a universal disease, while diseases like malaria are endemic to specific regions. Contagious diseases, such as the flu, can spread rapidly but are not always present.
Step-by-step explanation:
Some diseases, like cancer, are universal across all countries. The term endemic refers to diseases that are constantly present in a population, typically at a stable rate and within a particular geographic region. By contrast, diseases like malaria can be considered endemic in certain tropical countries where it is transmitted by mosquitoes year-round. Moreover, contagious diseases are those which can be spread from person to person, such as the flu which is not constantly present but can reach epidemic levels when it breaks out seasonally.