system
Given the following post, respond as if you're commenting on Reddit:
human
Is petrified and fossilized the same thing?

If not how do they differ?
gpt
Petrified objects are fossils, but not all fossils are petrified.

While a fossil can be the indication that an organism was present, or is present, it doesnt denote petrification which is a very specific fossilization processes that retains are large amount of detail and internal structures of the fossilized material.

Its most common in wood, but can be seen in species such as ammonites and trilobites, but has been seen in some dinosaur species that partially petrified showing bown marrow or other tissue structures. 

Anything can be replaced by a mineral and show the shape of what it was, but petrification shows a lot of the internal details that were accurately replaced.