C) Nitrogen
I absolutely positively positive about this
Answer:
Oxygen and carbon dioxide flow through the blood in the placenta. Most of it goes to the heart and flows through the baby's body. At birth, the baby's lungs are filled with fluid. ... Increased oxygen in the lungs causes a decrease in blood flow resistance to the lungs.
You should consider how much you want to make, so make a budget. See if the equipment is good quality.
your answer is:
B. The angle of the slope.
