Types of paleontology includes vertebrates and invertebrates
Vertebrates are organism that have backbone. Backbone presence shows that organism have skeletal remains. Skeleton is the hard part of an organism which are preserved through years and are now studied. As the soft parts of organism are decayed through time but hard skeleton preserved are discovered.
InvertebratesThere are many organism which do not have backbone hence do not have skeleton in them but there are hard parts of an organism which are preserved. Shell remains which are made of mostly silicates and calcium are preserved. The remaining body can be assumed and studied.
This study helps in examining and interpreting creature habitat, body functions and food consumption.