The answer will be b. membrane.
The half life of a scandium-46 is 84 days. The scandium-46<span> is used in oil refining as a tracer to monitor the oil movement and it emits </span><span>extremely high energetic gamma/beta radiation. So the half-life of the radioisotope scandium-46 is 84 days. The </span>Scandium 46 created by neutron activation, is a synthetic isotope of Scandium.
Single replacement means only 1 will bond. Ag + KNO3 --> AgNO3 + K
Just a rough sketch
A direct current flows in one direction and an alternating currents flow consists of electrons switching back and forth