7.7 Quiz answers
There are four ways: every object in an environment must have a name; order doesn’t matter; environments have parents; environments have reference semantics.
The parent of the global environment is the last package that you loaded. The only environment that doesn’t have a parent is the empty environment.
The enclosing environment of a function is the environment where it was created. It determines where a function looks for variables.
<-always creates a binding in the current environment;
<<-rebinds an existing name in a parent of the current environment.