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Hard parts such as bones, teeth, and shells are most likely to become fossilized as they have a higher chance of being preserved over time. Soft tissues like muscles and organs usually decay before fossilization can occur.
Soft animal parts can become fossilized through a process called carbonization, where organic material is compressed and heated under sediment, leaving a carbon residue. This can preserve delicate structures like feathers or skin. Another way is through replacement, where minerals gradually replace the organic material, preserving the shape and detail of the soft tissue.
When an organism dies, it can become buried in sediment which helps protect it from decay. Over time, minerals from the surrounding environment can seep into the organism's tissues, gradually replacing them and forming a fossil. The process of fossilization can take millions of years.
One condition that best increases the chance that an organism will become fossilized is if the burial happens rapidly. Another condition that can increase the chance of an organism becoming fossilized is if the organism has hard body parts.
The most usually fossilized parts of organisms are bones and shells. These are least likely to rot or wear away before they are buried and mineralised. In rare instances the soft parts of the bodies are preserved and are normally shown as thin films on the rock surface.
Those that have body parts that are already mineralized. eg. shells and bones. A coral reef is a prime candidate.
Most of the time only the bones can be fossilized due to the fact that all other muscle/tissue are decomposed when they are under pressure.
Fossils can form from both soft parts and hard parts of organisms. Soft parts can become fossilized through processes like carbonization or preservation in amber, while hard parts like bones or shells can undergo mineralization or replacement to become fossils.
All parts of plants have been fossilized.
teeth as in fine toothed comb
Rapidly buried by sediments
The body parts of a Saber-toothed Tiger that were impressive was the massive muscles in their body. Another body part of the Sabor-toothed tiger that make the animal impressive were the bone shattering canine teeth.