The level of respiratory tract where air is max moistened is A. Nasal cavities
B. Nasal openings
C. Air sac
D. Trachea

The european union was formally established in

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.