to use all available means, to use everything at one's disposal, to take advantage of every resource in one's environment, to put everything to good use, to be resourceful
to catch as catch can (to use all available means, to use everything at one's disposal, to take advantage of every resource in one's environment, to be resourceful)
to prove, to serve as proof (of/that), to be evidence (of/that), to bear witness (of/that), to attest (to/that); to be reliable; to be valid; to prevail