A. The pressure is lower as you gain altitude because there are more molecules of oxygen and nitrogen. B. The pressure is lower as you gain altitude because there are less molecules of oxygen and nitrogen. C. The pressure is the same because there is no change in the number of molecules.
The price of a cockatiel depends on a few factors. Firstly the price depends on whether or not the bird is tamed. For a tamed cockatiel it would cost around $80 - $120 and a untamed cockatiel would cost $15-$30 (AUS) Also the colouring of the cockatiel plays a part in the cost of the bird, as more rare colours (such as lutino or pearl cinnamon) may increase the cost of the cockatiel.
Cockatiel - White Faced found on January 16, 2018 in Los Angeles, California, United States 90016 Found in Hawthorne white med sized bird Parrot - Medium found on January 15, 2018 in Hawthorne, California, United States 90274 Found Sun Conure North Richardson, TX 1/17/18 Conure - Sun found on January 17, 2018 in Richardson, Texas, United States 75082 NV.