How Did the Brachiosaurus become Extinct?

At the end of the Cretaceous Period all the dinosaur families, as well as about 75 percent of all other species on earth, went extinct.
There are numerous theories for this great extinction.
Use the links below to find out when the Brachiosaurus became extinct and find at least two theories for how it happened.
After you record your answers on your worksheet, please click here!

DinosaursFaq.com
EnchantedLearning.com
WalkingWithDinos.com
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