Final answer:
In less developed countries, factors such as access to clean drinking water and sanitation, healthcare access, and control of infectious diseases play crucial roles in changing life expectancy. Haiti's life expectancy could be influenced by improvements in these areas from 1995 to 2015.
Step-by-step explanation:
One factor in a less developed country that could contribute significantly to a change in life expectancy is the access to clean drinking water and sanitation facilities. The presence of clean water and proper waste disposal systems can drastically reduce the spread of diseases, which in turn can increase life expectancy. For example, data have shown that advancements in public health and sanitation, including clean drinking water and sewage disposal, have been primary factors in life expectancy increases worldwide. In Haiti, between 1995 and 2015, similar improvements could potentially lead to significant changes in life expectancy.
Healthcare access is another critical factor that affects life expectancy. In countries with inadequate healthcare services, there are higher risks of infant mortality and preventable diseases claim more lives – both of which can depress life expectancy averages. Improvements in healthcare, including the availability of skilled health-care providers and essential medical supplies, could make a considerable impact.
Moreover, addressing infectious diseases, such as HIV/AIDS, tuberculosis, and malaria, through increased medical innovation like antibiotics and vaccines, can lead to better health outcomes and improve life expectancies in developing nations. In regions affected severely by HIV/AIDS, this has shown to have a direct impact on life expectancy trends.