________ Active listening is listening to someone without having to reply, such as when you are a member of an audience

Which of the following is controlled by the levels of CO2 and O2 in the blood and cerebrospinal fluid?

A) Ventilation B) Respiration C) Cardiac output D) Inspiration

If you need to have flexibility in your travel plans, you should purchase a more expensive ticket or purchase ________.

A. Travel vouchers B. Travel insurance C. Two different tickets D. Service tickets