The correct answer is c.: it served as the be boundary between North Korea and South Korea. The current line is in a similar place, but it's not a straight line, unlike the line running along the 39th parallel.
Answer:
2. Secretion of antibodies.
Explanation:
A cell that has a large endoplasmic reticulas and Golgi aparatus, is often used to secretion of antibodies, in order to keep them in the cell and then secrate the antibodies necessaries for the body.