The problem is that when you try to pin down what these mean, you find that they refer to doing things that all living things do but just in a particularly human way.  All living things have the ability to change themselves in order to handle the challenges of the environment. It is just that when humans do we call this "learning." All living things find ways to process data from the environment in order to accomplish tasks, and it is only when humans do it that we call this "thinking" and "understanding." 