Instead of solving a problem using one large code segment, we can base that solution off of the solutions of smaller sub-problems. This is often referred to as modularity. This helps to manage the complexity of the program and can be done in the form of what type of abstraction

What computer network component allows data transfers from one computer to another through a telephone line?

The forerunner to cell phones, pdas, and smartphones was

People with high self-esteem: accept their strengths and weaknesses. believe that failed experiences are failures of their whole self. feel good about who they are only when they reach total success. need positive external experiences to counteract negative feelings that constantly plague them.