Objectively, the most terrifying pre-K/T extinction land animal was the Tyrannosaurus Rex.

I thank you Con, please when you see me telling you that you are partly false do not take it as an offence, I wanted you to cite the full source.Spinosaurus:Con still asserts that the source say 59ft, but that was too great, as In 2007 scientists refuted that Spinosaurus was up to 59ft "François Therrien and Donald Henderson, in a 2007 paper using scaling based on skull length, challenged previous estimates of the size of Spinosaurus, finding the length too great and the weight too small. Based on estimated skull lengths of 1.5 to 1.75 meters (4.9 to 5.7 ft), their estimates include a body length of 12.6 to 14.3 meters (41 to 47 ft) and a body mass of 12 to 20.9 tonnes (11.8 to 20.6 long tons; 13.2 to 23.0 short tons)."[1]While Con uses the 2005 estimates which states the following:"Dal Sasso et al. (2005) assumed that Spinosaurus and Suchomimus had the same body proportions in relation to their skull lengths, and thereby calculated that Spinosaurus was 16 to 18 meters (52 to 59 ft) in length and 7 to 9 tonnes (6.9 to 8.9 long tons; 7.7 to 9.9 short tons) in weight."[1]I cited the more advanced and authentic source and Con was indeed false when he said the following:"The part of source which you quoted about the Spinosaurus was actually an incorrect earlier estimate."When In fact I quoted the new and advanced source.Therefore Spinosaurus is only 1-7 ft higher than T-Rex, but T-Rex can bite and completely annihilate Spinosaurus.Quetzalcoatlus:I will debunk Con's rebuttal by using his own source(I know cool right!!?)Even by the source Con provided it clearly says that following:"Quetzalcoatlus was a pterodactyloid pterosaur known from the Late Cretaceous of North America (Maastrichtian stage) and one of the largest known flying animals of all time."[2]The source further says:"In 2010, Mike Habib, a professor of biomechanics at Chatham University, and Mark Witton, a British paleontologist, undertook a further investigation into the claims of flightlessness in large pterosaurs. After factoring wingspan, body weight, and aerodynamics, a sophisticated computer program led the two researchers to conclude that Q. northropi was capable of flight "up to 80 miles an hour for 7 to 10 days at altitudes of 15,000 feet". Mike Habib further suggested a maximum flight range of 8,000 to 12,000 miles for Q. northropi."[2]And Con did not provide source that Quetzalcoatlus, is on land for most of the time, clearly his source disagrees with him.Carcharodontosaurus:I have said you are partly false because you did not quote the full measurements, Carcharodontosaurus is sometimes -1-3 ft Higher(or lower) than T-Rex, but few ft won't do anything as, T-Rex bite force is just too strong to handle.Small issues:"a lack of maneuverability and smaller size as compared to Carcharadontosaurus and Spinosaurus"I am afraid you are false, as T-Rex was only smaller around 5 ft than both said dinosaurs, therefore science disagrees with Con as Newton's second law says: "The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is the same direction as the net force, and is inversely proportional to the mass of the object. In other words, net force divided by mass is equal to acceleration. If you have a net force that is greater and the mass is the same, the object's acceleration will be higher. If the mass is greater and the net force is the same, the acceleration of the object will be lower."[3]Therefore T-Rex was faster and with his bite force he could kill said dinosaurs easily."Megalodon is a prehistoric shark. I fail to see why that is relevant to this discussion, especially considering the fact that T-rex couldn't even swim!"I have stated that his bite force is equivalent to Megalodon, that is it, I did not want to include Megalodon because I am defending T-Rex in this debate."With the maneuverability and size advantages my animals have over Tyrannosaurus, T-rex would be ripped to shreds before he got the chance to clamp his jaws around them!"I have already refuted that, and said that size advantages are very low(1-7 ft) therefore T-Rex has more maneuverability and can crush the said dinosaurs.Also I do not think 3 dinosaurs against T-Rex is fair, in a fight, obviously T-Rex will lose against 3 huge dinosaurs.[1]http://en.wikipedia.org...[2]http://en.wikipedia.org...[3]http://fc.codmanacademy.org...