Through checks and balances
No..... If they're illegal, what's the point?
Deductive reasoning is also referred to as top-down reasoning, because it starts at the "top" with the more general understandings, working "down" to specific conclusions.
The only species that of hominid that still exist today is homo sapiens or us.
After the death of Marcus Aurelius, the Roman empire slowly started to decline. Potential new emperors began to focus on pleasing the rich Patricians at the expense of the poor plebeians . The resulting decadence was just one reason for the fall of the empire.
(It needs to be pointed out that as the question seems incomplete and lacks more context, the answer might not meet the its standards).