[Answer] What happens to soft parts of organisms when cast fossils form?

Answer: The decay
What happens to soft parts of organisms when cast fossils form?

Soft-bodied organisms are animals that lack skeletons. The group roughly corresponds to the group Vermes as proposed by Carl von Linné. All animals have muscles but since muscles can only pull never push a number of animals have developed hard parts that the muscles can pull on commonly called skeletons. Such skeletons may be internal as in vertebrates or external as in arthropods. However many animals groups do very well without hard parts. This include animals such as earthworms jellyfish tapeworms sq…

Sometimes the bioimmured organism is soft-bodied and is then preserved in negative relief as a kind of external mold. There are also cases where an organism settles on top of a living skeletal organism that grows upwards preserving the settler in its skeleton. Bioimmuration is known in the fossil …

In geology petrifaction or petrification is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals. Petrified wood typifies this process but all organisms from …

The fossil record is very uneven and with few exceptions is heavily slanted toward organisms with hard parts leaving most groups of soft-bodied organisms with little to no fossil record.

The taphonomic regime results in soft tissue being preserved which means that organisms without hard parts that could be conventionally fossilised can be seen; also we gain an insight into the organs of more familiar organisms such as the trilobites.

A trace fossil also ichnofossil (/ ˈ ɪ k n oʊ f ɒ s ɪ l /; from Greek: ἴχνος ikhnos “trace track”)…

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