Chapter 29
Biology: A Guide to the Natural World · 3 exercises
Problem 1
When smallpox raged in England in the 18 th century, most of its victims were young children. Meanwhile, the people least likely to die from it were senior citizens. Why should this have been so?
4 step solution
Problem 2
Public health officials agree that, since the 1960 s, as thma has been increasing among children in developed countries such as the United States. Among the tentative explanations for this increase is the "hygiene hypothesis," which holds that the problem is that many children are growing up in environments that are "pristine" -very clean and devoid of household pets. What could the linkage be between an immune system condition such as asthma and growing up in a pristine environment?
4 step solution
Problem 3
One of the key treatments for children who lack an immune system is a bone marrow transplant. Why would this procedure help to establish an immune system in a person who does not have one?
4 step solution