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Explanation:
Body Fossils and Trace Fossils
The fossils of bones, teeth, and shells are called body fossils. Most dinosaur fossils are collections of body fossils. Trace fossils are rocks that have preserved evidence of biological activity. They are not fossilized remains, just the traces of organisms.
Answer:
The most common directly preserved fossils are unaltered hard. parts of living organisms like shells, teeth and bones.
Other examples of this type of preservation include fossils corals, shells, sponges, microscopic fossils and a host of other organisms with hard parts.