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" ... Fossils can be found all across the Earth. The fossilized bones and shells of ancient organisms has helped us understand the evolution and history of life on Earth. While fossils are relatively common, not every organism that dies will fossilize. Typically a fossil is formed when an organism dies in mud or silt. The soft tissue decays, but as the sediment hardens into rock, minerals can seep into the bones and shells creating a fossil. Since Earth has always been a wet dynamic world, we have a rich fossil record spanning billions of years. In principle fossils could form on any planet with water and life. There could be distant exoplanets with a rich fossil history. But there could also be fossils on Mars. ... "
" ... It should come as no surprise training a dinosaur is not as straightforward as it seems. Do we have any evidence dinosaurs could be trained? This sort of behavior will never fossilize, but we can find a comparison by looking at birds. Falconry, the art of training modern raptors like hawks to hunt and return with their prey, shows that just maybe Cretaceous non-avian raptors could also be trained. ... "