Answer to Question 1
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Answer to Question 2
We arrive at major use cases by analyzing domain concepts marked as process or function. But the conversion ratio is not one-to-one. A use case has features four required components that a function or a process may lack. Sometimes we have to break up a process into more than one use case; at other times we might have to combine pieces of multiple processes or functions to arrive at one use case. Other domain concepts, such as objects or business rules, might find their way into use cases if the context requires it.
Experiment of Lederberg and Tatum demonstrating gene transfer in E. coli
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Radio Telescope
Graphing Psychological Data
Energy Transfer Processes: Free Convection
Transmission of petite phenotypes in Saccharomyces cerevisiae