Evolutionary medicine attempts to find evolutionary explanations for the persistence human diseases and medical problems in general. Which explanation best helps us to understand why selection has not made swallowing safer for modern humans? a. late acting traits have smaller selection coefficients and are more likely to be in by drift b. antagonistic pleiotropy c. historical contingency placed the lungs near the stomach and the evolution of speech exacerbated the problem d. alleles that contribute to choking risk are recessive making their elimination from the population difficult e. a trade-off between the need to eat and the need to respire