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.
Many people when they get a cockatiel want to know How Long Does A Cockatiel Live ?. The average lifespan of a cockatiel is around 12 years to 15 years. However, if you look after your bird well and ensure that it eats healthily, you can extend the lifespan of your cockatiel to even 20 years if not more. Cockatiels are quite intelligent and can be taught to whistle, imitate sounds and even speak.