Disable functionality thru commenting out a use

I want to disable some functionality by making it conditional that it's
use statement is in the script.

How in general can you tell if a module is present or loaded? if
defined(X) what should X be?

I want to disable some features in a big perl script by
conditionalizing the code that relies on those modules and be able to
disable those features by comment out the "use" line for the modules.

.

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