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philosophers normally make theory's and study more however scientists use a method to get an answer
These philosophers believed in the social contract theory of government.
The influential theory of social contract is associated with philosophers like Thomas Hobbes, John Locke, David Gauthier and Jean-Jacques Rousseau.
It is a theory, therefore it was not discovered. It was thought up by scientists and philosophers.
democritus was greek philosophers.
the Greek Philosophers did not test their theory.
Actually Aristotle wasn't known to contribute to the evolution theory as he didn't agree with most of the theories that were brought up by other philosophers. The only contribution he might have taken apart of was causing conflict between other philosophers and other theory discoveries.
Hobbes, Locke, and Rousseau
Earlier philosophers thought the're might be no possibility to gain any kind of knowledge. Hegel had no doubts about the existence of knowledge. He thought there was a system with a theory, a reverse theory and out of both came the better theory, who got a reverse-theory and out of them came a better theory. This system will go on, and in the end, we will have reached the point of knowing everything.
Technically, NO. For Philosophers may try to teach people a religious philosophy of their own, but in reality they believe and act a totally different way. Most of the time they do have a theory of ethics.
philip kotler
There are a number of philosophers associated with empiricism, which is the theory that knowledge comes only through experiences. Some of the more well known philosophers associated with empiricism include, Aristotle, Francis Bacon, John Locke, and Karl Popper.