29. Some animal species are in danger of _____.(A) distinction (B) instruction (C) extinction (D) function

39. What do the study authors suggest about the interaction between asthma, sleep,and depression?(A) It is well understood and requires no further research.(B) Further research is needed to understand the mechanisms behind theseinteractions.(C) Sleep and depression have no impact on asthma.(D) Asthma causes sleep and mood disorders in all patients.