What is described as the only one way from start to finish in algorithm design?

In algorithm design, sequences are structured as a series of steps or operations that are executed in a specific order. This linear flow from one step to the next creates a straightforward path from the beginning of the algorithm to its conclusion. Every instruction within a sequence must be followed in the given order without deviation, making it a one-way process.

Other options like iterations, selections, and decisions introduce variations in the flow of the algorithm. Iterations involve repeating a set of instructions based on a condition, selections allow branching in the algorithm based on certain conditions, and decisions introduce conditional logic that can change the path taken through the algorithm. However, sequences are characterized by their unchanging, direct pathway from start to finish, which is why they are described as the only one way.