How to classify paleontology?

Scientists have established branch genealogy maps and genealogy trees for fossil records (paleontology, skeletal structural characteristics) and genes (modern biology, molecular biology) respectively, but they are very different. For example, paleontologists use the traditional genealogy tree established by fossil and bone records to divide mammals into ungulates, tubular teeth, jerboa and hedgehog. However, among the four genetic lineages established by geneticists according to the DNA gene sequence of living animals, they all belong to African true mammals and have a single genetic relationship (the other three are arthropods, Eurasian true mammals and true Aquinda Dormouse mammals). Original address: kids.yam/why/article/article604.

Zh。 * * */wiki/%E5% 8F% B2% E5% 89% 8D% E7% 94% 9F% E7% 89% A9 Organisms are generally divided into two kingdoms: the plant kingdom and the animal kingdom. In the process of dividing the two fields, it is found that some organisms, such as flagellates, often have the duality of plants and animals, and it is difficult to belong to either field. It is suggested to use the three-boundary division scheme, that is, to set up a protozoan outside the plant and animal boundaries.

Including protozoa and some lower algae. The main classification levels of organisms are phylum, class, order, family, genus and species. As long as there are: protozoa, polypods, archaea, coelenterates, worms, bryophytes, brachiopods, mollusks, arthropods, echinoderms, graptolites, vertebrates, archaea, conodonts.

Reference: cht/x/xfbsd