The protein that carries oxygen in our blood is known as

• anemia.
• hemoglobin.
• amino acid.
• messenger RNA.

Hemoglobin.

The protein that carries oxygen in our blood is known as hemoglobin. To arrive at this answer, we can eliminate the options that are incorrect through the process of elimination:

- Anemia is a condition characterized by a decrease in the number of red blood cells or a decrease in the amount of hemoglobin in the blood. It is not the name of the protein itself, so this option can be eliminated.
- Amino acids are the building blocks of proteins, including hemoglobin. However, amino acids themselves are not the oxygen-carrying protein, so this option can also be eliminated.
- Messenger RNA (mRNA) is a molecule involved in transmitting genetic information from DNA to the ribosomes, where protein synthesis takes place. It is not the protein that carries oxygen in our blood, so this option can be eliminated as well.

By the process of elimination, we are left with hemoglobin as the correct answer. Hemoglobin is an iron-containing protein found in red blood cells that is responsible for binding to oxygen and transporting it from the lungs to the body's tissues.

The protein that carries oxygen in our blood is known as hemoglobin.