Introduction: The name of the animals that I'm researching is called the Asiatic Wild Horse. The Asiatic Wild Horse is the last surviving subspecies of wild horse. This type of wild horse are herbivores. The Asiatic Wild Horse are much smaller than domesticated horses. They have pale bellies and a reddish-brown coat. Their fur is short during the summer and longer during the winter. The Asiatic Wild Horse lived all over Europe and Asia. These horses were kept in captivity since 1969, but they have been reintroduced into Mongolia. They live in grasslands. Asiatic Wild Horses are classified as animalia in the animal kingdom. Their phylum is Chordata. The wild horse's class is mammalia. Their order is perissodactyla. Its family is Equidae. Its genus is Equus. Asiatic WIld Horses are an endangered species.
Morphological & Molecular Evidence: The relatives of the Asiatic Wild Horse are the European Wild horse, Donkeys, the Kiang, and the Grevy's Zebra.
The horse and the donkey share a very similar bone structure within their bodies. This can show how these animals came from the same ancestor and share the same characteristics. The bone structure of the legs are the same as the horse's ancestors, but without the toes. This can show that these horses are closely related and evolved from the same ancestor.
Homologous structures are in an organism's bone structure that are shared among other organisms, but the similar bone structure have different uses in different organisms that allow them to better adapt to their environment. The horse, bat, human, and dolphin all share the same bones in different places in their skeletons. Humans have their homologous structure in their arm, the bat has theirs in their wings, the dolphin has their homologous structures in their fins, and horses have theirs in their legs. This shows evidence of evolution of the Asiatic WIld Horse because these animals have had to come from a common ancestor that allowed these animals to get their homologous structures.
Vestigial Structures: Over millions of years ago, the earliest horses had 3 to 4 toes on their. Overtime of evolution, horses began to lose their toes and develop a single hoof. There are still traces of these vestigial bones above their hoofs.
There are toes, or phalanges in the horse, which are circled, are vestigial structures because the horse doesn't need toes anymore. Horses use their hoofs to stand, walk, or run. Vestigial structures are bone structures or organs that have no real function. Vestigial structures come from ancestors, and when the wild horse evolves, it begins to develop new features and get rid of old ones that are still present in their structure. Vestigial structures show evidence of evolution because the structures show that these horses used to walk with toes and not a single hoof.
The present wild horse has a longer leg bone structure and a bit thicker. As the ancestors go on, the bone gets shorter and more toes being to appear in their bone structures. The horse has gotten larger as it has been evolving. Also, the toes in the bone structures have been decreasing over the time of its path of evolution. Transitional fossils are bones that fall in between an ancestor's bone and a descendant's bone. The transitional fossil shows the transition of the evolution from an ancestor to a descendant. It shows evidence of evolution because for the horse, the Eohippus bone and the Merychippus bone are different from each other, but still have similarities. The Mesohippus bone falls in between the two ancestor's bone structure and shows the transition of how the merychippus bone was developed.
Comparative embryology is comparing embryos of different species to show similarities and differences between the embryos. Comparing embryos of different organisms can be used for evidence of evolution because the embryos show similarities, which means that these organisms can share a common ancestor. For example, human embryos have tails that are lost when the embryo begins to further develop. This can show that humans and other primates may possibly share a common ancestor.