What happens to air as it passes through the respiratory structures? A
The air is simply transported to the alveoli by the respiratory structures, while maintaining its temperature.

B
The air undergoes a series of reactions to break the oxygen down so it is more easily diffused in the alveoli.

C
The air is filtered and kept cool so no new pathogens form as it makes its way to the alveoli.

D
The air is warmed, moistened, and filtered so that it is clear of pathogens and can easily diffuse in the alveoli.

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec

Marking brainliest for original answer.. are these two triangles similar? how can you tell?