a fossil is any natural evidence of prehistoric life that provides some idea of the size, shape, or form of the organism. a fossil does need not to be a whole animal or plant. broken fragments are also fossils, as are the tracks left behind by the organisms. fossils provide important evidence of how life and environmental conditions have changed. the fossils found in rock formations of different time periods differ because the environment on earth has changed.
position of land masses of early pennsylvania can be determined through fossil records because we know that most plants presently live on land. from this information, we can infer?