Evolution of Horse: Evolution of horse was described by Othniel C. Place of Origin— Origin of horse took place in Eocene epoch.
The first fossil of the horse was found in North America.
A lineage is an evolutionary sequence, arranged in linear order from an ancestral group to a descendant group.
A trend may be progressive (a general increase in size of organs) or retrogressive (a general degeneration and loss of organs).
Thus, the organisms have been changing since their appearance, which supports that evolution has been taking place.
The fossil organisms which show characters of two different groups are called missing links.
There are more animal fossils as compared to plants.In the coenozoic era, the fossils of various mammals are abundant.On the basis of fossil study, it has been shown that the early organisms were very different from their modern forms, viz., the early man lived in the caves without any social life and spent their life like beasts, but man progressed and the modem man has become civilized, and leads a vigorous social life.It is due to presence of slow decaying harder structures in their endoskeleton and exoskeleton.(v) Ancestries of Some Animals: Palaeontologists have traced out complete evolutionary histories of some animals like horse, camel and elephant and man from the studies of their fossils.