What are the advantages of using signal flow graph over the block diagram reduction?

Explanation:

A signal-flow diagram is a system of points with directed branching connecting them. It portrays the movement of signals through one device point to the next, as well as the interactions between the signals.

answer; use multiple stimuli;

answer; the sound of a train whistle makes a woman think of an old friend; //

the smell of grass makes a by feel that spring is the best; (apex);