jaw
Jaws
Soft animal parts usually rot and do not become fossilized.
The parts of living things become fossilized when they are subject to a moist environment. Over time the living things are pressed into the moist ground and fossilized.
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.
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.
All parts of plants have been fossilized.
teeth as in fine toothed comb
They are different because casts and molds are just an imprint (or a copy) of the organism's body. The soft parts of the organism would most likely decay, and the shell, bones, or just the outer hard parts would be fossilized.
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.
Those surrounded by skeletal structures
slowly buried by sedments {: -DR. SCRAPOLOTS