Spinosaurus

For young Spinosaurus, any larger carnivore would have been a major threat.

As an adult, Spinosaurus was designed to eat fish, but lived alongside Carcharodontosaurus, Bahariasaurus, and Stomatosuchus, all of which hunted large dinosaurian prey. Carcharodontosaurus was a powerfully built theropod, or bipedal meat eating dinosaur, and they grew to be 43 feet long with a weight of between 6 and 15 metric tons. Bahariasaurus was also a huge theropod, possibly a ceratosaur, and its size rivaled that of Tyrannosaurus rex and Carcharodontosaurus. Stomatosuchus was a 33 foot long crocodile. In modern times, large carnivores generally don't get along with other large carnivores very well, so it stands to reason that Carcharodontosaurus, Bahariasaurus, and Stomatosuchus were threats to Spinosaurus, especially considering their more powerful jaws and larger teeth. Spinosaurus may have threatened each other, too.

The price one could get for selling a fossil of any kind depends on the type, who the buyer is, and the condition of the fossil. The tooth of a dinosaur like Spinosaurus could probably be sold for thousands or tens of thousands of dollars.

However, there are many laws regarding the possession, import, export, and sale of fossils, and they vary depending on the country and/or state or province you are located in. These laws are there to protect fossils, which are easily damaged. A damaged fossil means that priceless paleontological information is lost forever.

If you are in the possession of a fossil, especially one as valuable as a Spinosaur tooth, you need to immediately determine the laws in your area and I would recommend donating it to a local museum as soon as possible. If a fossil isn't in the right conditions and has been excavated, it is only a matter of time before pyrite crystals inside of it cause the fossil to self destruct.

Because a meteor struck Earth and it created volcanoes which shot ash into the air which stopped the sun's rays and plants died then plant-eating dinosaurs died then spino died

That is the correct spelling of the genus name Spinosaurus (a large carnivorous dinosaur).

Maybe the people you know believe that Spinosaurus could fight a Tyrannosaurus, but, most people believe the latter. In fact, Spinosaurus and Tyrannosaurus did not even live in the same time period, let alone the same continent.

While its not really known, it is a widely accepted theory that since Spinosaurus relied so much on the rivers and the shallow seas, as the environment around it changed, it got drier and slowly these environments of water dried out, thus completely devastating its main food source.

Spinosaurus does live in Egypt and Morocco‭ in Early Cretaceous in 112,000,000 to Late Cretaceous in 97,000,000 years ago. Aegyptosaurus, Paralititan, Bahariasaurus, Carcharodontosaurus, Aegisuchus, Araripesuchus, Elosuchus, Hamadasuchus, Kemkemia, Laganosuchus, Deltadromeus, Inosaurus, Rebbachisaurus, Sauroniops, Alanqa and Siroccopteryx.

Spinosaurus is estimated to have been 49 feet long and weigh 4.4 to 10 tons or more. Megalodon was at least 50 feet long and thus would have weighed over 53 tons. Thus, Megalodon was much heavier than Spinosaurus but was only slightly longer.

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Tyrannosaurus Rex was the most advanced and powerful large carnivore Dinosaur of all time...Especially its number one weapon...Its jaws are some of the most powerful jaws beside megalodon and I think predator x...Rex could bite with multiple tons of force meaning one bite to almost any animal would leave serious damage..Its teeth were meant to crush bone so while bite another animal the bone would easily snap being very painful..and if that didn't work the bacteria in it mouth would be on the wound,the rex would leave waiting for the animal to die,then smell out the corps...Rex had other strong feature all over its body..its neck,legs and even arms were backed by very powerful muscles..Though they are small you needed some way to get 7 tons of weight up in the morning...

Spinosaurus is another story..Its was big but in most places weak compared to T-rex..The only place were he POSSIBLY exceeded were the arms...Spinosaurus arms were meant for two purposes..one to use as a weapon on fish or threats..and this is my opinion but may have walked on all 4s....Why do I say this..well you notice other carnivores have short arms like trex and I doubt they walked on 4s unless trying to get up in the morning..But if you look at its cousins, Baryonyx and Suchomimus most depictions show them possibly walking on 4s...Spino weighs 9 tons(possibly) and how would you support that..using its powerful arms to walk...Now spino may have walked on 2legs too similar to Bears..standing on two to protect itself and/or intimidation....This would as have less damage on its spino if it fell... Shorter the distance the less damage to that not so flexible spine...

But back to your question in a basic answer T-rex was more powerful and advanced and would beat the snot out of spino..the later you exist the more advanced you are....IF YOU WANT TO ARGUE I'M LEGOCREATOR100 on youtube..:P

There is only one Mesozoic era, or "Age of Reptiles," which began 252.2 million years ago and ended 65.5 million years ago. The Spinosaurus lived between 112 and 97 million years ago, during the Albian and then the Cenemonian stages of the Cretaceous period. The Cretaceous was the third and final period of the Mesozoic era.