They were adapted to an environment and once it is taken away the plants will slowly start to die. I'm not 100% :)
When bonding occurs a new substance with new properties is formed.
Answer:
cast
Cast fossils are the type people are most familiar with, as they make up the spectacular dinosaur skeletons that on view in museums. Cast fossils occur when minerals deposit into the mold left by the rotting organic material, resulting in a three-dimensional replica of the hard structures of the plant or animal
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