C.Adenine and guanine<span> are </span><span>purines in DNA.</span>
An ocean current is any more or less permanent or continuous, directed movement of ocean water that flows in one of the Earth's oceans. The currents are generated from the forces acting upon the water like the earth's rotation, the wind, the temperature and salinity differences and the gravitation of the moon.
this is because the blood flow slow through the capillaries to allow gaseous exchange. Plus the pressure is higher in capillaries because the diameter of the capillaries is smaller than arterioles
The answer is D.crust and upper mantle
