38. Question: Between which months of age does sudden infant death syndrome (SIDS) most often occur?

39. Question: In which primary immune deficiency is there a partial-to-complete absence of T-cell immunity?

40. Question: Blood vessels of the kidneys are innervated by the:

41. Question: An individual is more susceptible to infections of mucous membranes when he or she has a seriously low level of which immunoglobulin antibody?