If this is multiple choice then I am sorry this is not the answer you are looking for but all of these substances are in breast milk.
Answer:
the right ventricles
Explanation:
The right ventricle pumps the blood from the right atrium into the lungs to pick up oxygen and remove carbon dioxide. The left atrium receives blood from the lungs. This blood is rich in oxygen
Re-enter would be your answer
Hope this helps :)
What has led to millions of u.s. children and adolescents being overweight and obese?
a. computers and technology