GENERAL HISTOLOGY

Detailed explanation-1: -The hard parts of organisms, such as bones, shells, and teeth have a better chance of becoming fossils than do softer parts. One reason for this is that scavengers generally do not eat these parts. Hard parts also decay more slowly than soft parts, giving more time for them to be buried.

Detailed explanation-2: -Animals with hard shells and skeletons are represented well in the fossil record. On the other hand, soft-bodied animals are probably represented very poorly. It’s likely that most soft-bodied species that ever existed are gone forever without a trace.

Detailed explanation-3: -The most common fossils come from hard tissues, such as shells, bones, and tree trunks.

Detailed explanation-4: -Animals with hard parts are more likely to be preserved than animals that have soft bodies. Aquatic animals are more likely to be preserved than terrestrial animals because water ecosystems have greater preservation potential.