What is the primary role of the respiratory system in living organisms?

a. to make carbon dioxide

b. to obtain oxygen

c. to use up nitrogen

d. to find hydrogen

The horse latitudes-high-pressure zones about 30 degrees north and 30 degrees south of the equator.-warm air traveling away from the equator cools and sinks-weather tends to be clear and drythe doldrums-low-pressure near equator-air rises and spreads out toward the poles-rising moist air produces clouds and heavy rainthe westerlies-blow from the west-move from the horse latitudes toward the poles.-bring storms across much of the united statesthe tradewinds-blow from the east-move from the horse latitudes toward the equator  -strong, steady winds

Some type of thing that was invisible

Ithink it is c ,i hope i you