nitrogen comes from an air that is called fractional distillation.
The human respiratory system<span> is a series of organs </span>responsible<span> for taking in oxygen and expelling carbon dioxide. The primary organs of the </span>respiratory system<span> are lungs, which carry out this exchange of gases as we breathe.</span>
Proteins and fats i believe... Its been awhile.
Answer: amino acids can be formed together to make proteins. They can be obtained by food like eggs tofu and nuts. There are 20 different amino acids but the human body only needs 10 of them to live. These 10 amino acids are called essential amino acids. Amino acids are made up of amine , carboxyl and an R group.
Explanation: you can find amino acids on earth from food that is filled with protein . Meat eggs and nuts are good options.
<span>Pulmonary vein
Pulmonary circulation is the movement of blood starting from the heart, where deoxygenated, or carbon dioxide-filled, blood leaves from the right ventricle and through the pulmonary valve, then into the left and right pulmonary arteries and arrives at the lungs. During the process of respiration, the carbon dioxide is released and oxygen is added to the blood. </span>
