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What dinosaur is bigger a megaraptor a utahraptor or a velociraptor?
velociraptors are about 3 foot tall utaraptors are about 6 foot tall and megaraptor is alot bigger, like nearly allosaurus size- as it is an allosaurid
How did the albertosaurus become extinct?
The last Allosaurus died because it was redundant. Allosaurs as a whole didn't die off completely until somewhere in the middle cretaceous period, and they did very well up until that point. Thus, a more appropriote question might be "What did Allosaurus evolve into?" Another Allosaurid that we can't exactly pinpoint is the answer to that. There is an early cretaceous true allosaurid that was living on Australia/Antarctica, but last I heard it had not been completely identified as a new species. Of course, an American theropod like Allosaurus somehow evolving into a dwarf species in Antarctica sounds a little iffy, but Allosaurus most certainly evolved into a more specialized form in the millions of years following the end of the Jurassic. Allosaurs as a whole (and that is including the Early Cretaceous carcharodontosaurs) went extinct due to pressure from even more specialized predators like the Tyrannosaurs and Abelisaurs (Carnotaurus and the like).
Did the allosaurus evolve?
Allosaurus reproduced by laying hard shelled eggs, most likely in a nest of vegetation to incubate the eggs. It is unknown whether there was any parental care involved, and if there was, how much is also unknown.
