Fossil records can be hard to interpret because sometimes the older fossils that are about more than three billion years old becomes fragmentary. Also some fossil records that are in mountainous areas are eroded by wind or water, destroying the fossil. Fossils are also unreliable because not all bones of the same animal survive equally the same such as larger lightweight bones deteriorate more quickly and aren't that fossilized but small, delicate bones are crushed and carried away. Other fossils may only have a bone or two, making it hard to interpret what kind of organism it came from.
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