Your appendix is very useful in some mammals. It is vestigial organ in humans. Another is your tail bone. It is remnant of tail in monkeys. Tail is very important for the monkeys for balance on trees.
VESTIGIAL
Vestigial structures are anatomical structures of organisms in a species which are considered to have lost much or all of their original function through evolution.
Homologous structures are the remnants of structures long ago that have evolved into other things now. This is why they are evidence of evolutionary relationships.
The organ structure rugae can be found in a number of anatomical structures in the body.
vestigial
Anatomical structures provide physical characteristics that can be compared across different organisms to identify similarities and differences. These similarities and differences can help in grouping organisms into taxonomic categories based on shared traits. By analyzing anatomical structures, scientists can infer evolutionary relationships and determine how various species are related to one another.
Anatomical structures are definable parts of the body, such as internal organs, limbs, and so forth.
The anatomical structures designed to cushion joints is the cartialge. The combining form is chrondr/o
A structure in an organism that serves little to no use. Vestigial structures are degenerated and range from slightly harmful to useless to slightly useful. They are remnants of an organism's evolutionary past.
http://www.barbarylion.com/Anatomy.htm
Amino Acids?
cartilage
In the inner ear.
heart
VESTIGIAL
Anatomical directional terms and bodyplanes describe the locations of structures in relation to other structures or locations in the body.
they are remnants of structures found in the ancestral species