"The gap between AC and AVC keeps on decreasing with rise in output, but they never meet each other". Comment.

Answer the following question: (i) Why does AFC curve never touch the X-axis ? (ii) Why does TVC curve start from origin? (iii) Why AC, AVC and MC curves are U-shaped ? (iv) Why are the gap between TC curve and TVC curve remains constant with rise in output ? (v) Why does AC curve lie above the AVC curve ? (vi) Why does TC curve and TFC curve start from the same point above the origin?

Two _____ never intersect each other.

Two parallel lines meet each other at some point.