Answer: 1) 9 2) iron
Explanation:
1) From research, 9 amino acids can not be made by an healthy adult, are arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine
2) Iron plays a vital role in the build up of hemoglobin in the body. Transferrin protien binds to iron to transport it throughout the body, helping to make the red blood cell. To grow or raising the hemoglobin level is by eating or taking food that contains enough iron
D all of the above is correct
