Ais an internal sac-like respiratory surface that allows oxygen to be absorbed from the air.
a. lung
b. trachea
c. gill
d. pharynx

Which of these gives the best indication that a health service is based on pseudoscience?

Describe factors that can make dishes in restaurants have nutritional values

Where does peer pressure come from? a.the power of culture b.the influences of others c.people who purposely try harm you d.the messages in tv commercials