The correct answer is option 2: Haemoglobin carries oxygen. Haemoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to the body`s tissues. It does this by binding to oxygen molecules in the lungs and releasing them where they are needed. The molecule contains iron, which allows it to combine with oxygen and gives it its red color. Without haemoglobin, the cells in our body would not receive the necessary oxygen to function properly. It is important to note that haemoglobin does not provide amino acids (option 1), enzymes (option 3), or aid in excretion (option 4). Alert - The correct answer should be option 1: Haemoglobin provides amino acids.