Where does Spinosaurus go in the Dewey Decimal System please? Also Dinosaurs as a whole.
Dinosaurs as a whole are under 567.9, while spinosaurus specifically would be under 567.912 for the clade saurischia (reptile-hipped dinosaurs)

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Where does Spinosaurus go in the Dewey Decimal System please? Also Dinosaurs as a whole.
Dinosaurs as a whole are under 567.9, while spinosaurus specifically would be under 567.912 for the clade saurischia (reptile-hipped dinosaurs)

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would you know why a book about ice mummies at my library was classified 599 i feel like thats usually for animals. is the strong as fuck ice mummy a species
599 is about mammals. Human beings would be under 599.9, so maybe the book was about one of the subcategories; genetics, sex, age, anthropometry, environmental effects on physique, or ethnic groups. Was the ice mummy in question an earlier hominid? In that case it would make more sense to put it under 569.9 with Homo erectus and Neanderthals.
Looking up other books about ice mummies specifically, some are indeed classified in 599.9 for human remains, but most are classified in the 900s for history and geography of the region they were found in. The 930s, history of the ancient world. A lot of them are about intentional/ritual mummification in Ancient Egypt rather than natural mummification in swamps or tundras, so I don't think ice mummies have their own number.
do prehistoric animals and animals end up in completely different categories? like, bull sharks vs megalodon, or three-toed sloths vs giant sloths? or is it all under animals?
Living animals are in the 590s, extinct/fossil animals are in the 560s
bull shark (597.3) vs megalodon (567.3)
three-toed sloth (599.313) vs giant sloth (569.3)
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“Oh, I know. Of course I know that.” The astronaut gives a reassuring smile, wrapping the shorter man in a warm embrace he’d usually give in times like these, throwing a pat on the back to at least make the hug a little bit more welcoming.
He pulled away of course, but let his hands linger on their shoulders. “You’re going to do just fine tomorrow! I know you will. It’s a hard fight you’re facing, and…. you’ve been working so hard today, haven’t you?”
“Ah— I just. Apollo….” Clay’s features harden for a  moments.“It’s just you and me here. Tell me how you’re feeling….. please don’t bottle them up; you don’t have to anyways right now."