Think of it is this way. These are the 4 reasons
M-A-I-N
M: Military
A: Alliances
I: Imperialism
N: Nationalism
Hope this helped:)
Under Article I, Section 8 of the Constitution, Congress has the power "to make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or any Department or Officer thereof".
Yes if they didn’t observe and study real plants and animals then all the things we know now wouldn’t be true