. The blood leaving the tissues becomes richer in
A: Carbon dioxide
Blood is a type of fluid connective tissue.
It helps in the transportation of respiratory gases like oxygen and carbon dioxide.
Blood has a respiratory pigment known as hemoglobin.
Blood carries oxygen rich blood to tissues and in turn, receives carbon dioxide.
Now, the blood has a higher concentration of carbon dioxide.
Hence, the blood becomes richer in carbon dioxide.
Final answer :-
The correct answer is carbon dioxide, i.e option (A).