The respiratory system of the birds
First one is NAD+, second one is ADP
Its D for example if you have a piece of clay shaped as this rock and you put pressure on one side of the clay the side that you are putting stress on will go down with your hand because it is being held with pressure
ps. i have a hard time explainning things i can map it out in my head but not so muchin words.
The answer is a. the troposphere
