I think the answer is Passive
The answer is hard tissue.
Usually, hard tissue, such as bones and teeth or exoskeleton is much more preserved than soft tissue (organs, skin, etc.). Fossils become fossils by a process of mineralization. Hard tissues are more mineralized during life than organs. So it is no surprise that hard tissues take part in the process of mineralization and is preserved in fossils, unlike soft tissues.
a chemical reaction plants use to create food
Biological Classification.
The classification system starts with a group with a wide variety of organisms and becoming more selective as the groups get more specific.
Additional information: Carl Linnaeus classified organisms by shared characteristics.
