Concepts, Methods, and Techniques
The fossils studied by paleontologists are the remains, fragmentary or complete, of organisms that have existed or the traces they have left in geological formations. Usually, fossils correspond to the hard parts of living creatures, in the vertebrates to parts of the skeleton and the teeth. Exceptionally, very fragile soft parts such as the skin, hair, membranes, feathers, and eggshells are preserved.
KeywordsMonophyletic Group Biological Species Continental Deposit Phylogenetic Systematic Woolly Rhinoceros
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