In the method of fossilisation where minerals such as silica slowly replace the original tissue to form a rock-like fossil, preserving both hard and soft parts, the process is called what?

1. In petrifaction, minerals like silica penetrate and replace the original organic tissue. 2. This forms a rock-like fossil that can preserve hard and soft parts, as in petrified bones and wood. 3. In mold and cast the organism dissolves leaving only a shape, not a mineral replacement of tissue, which rules out option A. 4. So the process is petrifaction, option B. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 19 Origin and Evolution of Life "Fossilization", p.287_