Which part of an organism is preserved in cast and mold fossils?

bones

Explanation:

other parts such as skin etc is made up of soft tissue so it decomposes easily

bones

Explanation:

Fossils are archaeological records left in the ground or underground, they are the remains of animals and plants that have been preserved in a natural way for millions or even billions of years. They are preserved in mineral sediments, mainly silica; The process of fossilization consists in the transformation of organic matter into a mineral compound, but which does not lose its physical characteristic. A fossil can be defined as the replacement of organic matter from an animal or plant with minerals.

Bones are the part preserved in cast and cast fossils.