Evolutionary Time
Even when the continents were all crammed together as Gondwanaland, evolution had already been long underway. The reptiles were already roaming the land. Evolution has been continuing its glacial change as the continents slowly drifted to the their current locations. They are still moving just as fast as ever. That gives you an inkling of the inconceivably vast amount of time that evolution has had to work its magic.
~ Roedy (1948-02-04 age:70)