Molds and casts fossils preserve external shapes of organisms, bones are more likely to be preserved than soft tissues.
Molds and casts fossils preserve the external shape of an organism. For instance, a mold is created when the original material dissolves, leaving a cavity, and if that mold is filled with sediments or minerals, it forms a cast preserving the external shape. Soft tissues like skin, muscle, and organs are less likely to be preserved in the fossil record compared to bones and teeth due to their susceptibility to decay.
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