Question

The fossil history of humans is complete/fragmentary.

Answer 1

Fossils are the preserved remains or traces of ancient organisms. They are in the form of rock. They are helpful in providing the knowledge of the ancestors and the phylogenetic relationships of the organisms.

Complete answer:
The fossil history of humans is fragmentary because the fossils found earlier were only the teeth that were isolated or the single bones instead of complete skulls or skeletons. They were incomplete and due to this, the fossil history of the humans is incomplete. The approximate age of the fossils can be determined through various methods that include incremental dating or radiometric dating. Most of the species of the humans were extinct and were reconstructed to study the age of the fossils and thus it is fragmentary.
-Humans developed from a simpler form; it means evolution is a slow process that involves changes from simple to more complex forms.
-It is believed that evolution began in the ocean billions of years ago.
-The theory of evolution given by Darwin in his book 'the origin of species'. In which he stated that evolution comes through a series of natural selection.
Evolution in humans is dependent upon various processes that result in the change in the structure and function of the body, these processes include mutation, chromosomal abnormalities, reproductive isolation, genetic recombination, and natural selection. The evolution of humans involves the following stages: Dryopithecus , Ramapithecus, Australopithecus , Homo erectus , Homo sapiens , and Homo sapiens sapiens.

Note:
The fossils we currently obtain are only the hard body parts of organisms. The soft-bodied organisms do not remain to become a fossil as they will be decomposed by microorganisms. A major limitation of fossils is that only a small percentage of total fossil content has been discovered. Most of the fossils will not be complete as a major part of them would have gone by degradation or by weathering. The oldest fossil found to date is 3.5 billion-year-old microscopic fossils. This was found by the University of Wisconsin-Madison from Australia.