Final answer:
Soft tissues decay during cast fossil formation due to the dissolution of the original material, highlighting the importance of protection from decay processes for fossilization.
Explanation:
Soft parts of organisms decay when cast fossils form as the original material dissolves, leaving a cavity that can form molds and casts in the surrounding rock. Soft tissues like organs, muscle, and skin are more easily broken down in the decay process, making bones and teeth more likely to be preserved in the fossil record. For fossilization to occur, the organism must be protected from bacterial activity, scavengers, and temperature fluctuations, emphasizing the importance of a stable environment.
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