Which statement is true?
A. The fissures are muscles that surround the lungs and facilitate breathing.
B. The bronchioles move oxygen into the bloodstream.
C. The pleural cavity keeps the lungs attached to the ribcage.
D. The lobules maximize the number of places where oxygen exchange can occur.

How is health different for most people in this country today from what it was for people born in 1900? a. people have a shorter life span. b. people today work harder to survive. c. people today live in poorer sanitary conditions. d. people today can focus less on day-to-day survival and more quality of life.