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Biology Evolution Project

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Jack Stratton

on 18 May 2013

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Transcript of Biology Evolution Project

Horse Evolution Project Mr. O'Donnell's Biology Class Jack Stratton Tertiary Peroid (2.6 - 65 million years ago) Evidence: Larger & Stronger Body Structures.
Toe/Foot Evolved
Tooth Structure changed because it ate more herbs. Early horses supposedly lived in humid forests full of plants and trees. Their toes were angled out at different points which helped them from sinking in the marshy ground. Horses became grazers when climates became drier and many forests turned into fields. This is when horses tooth structure changed. Horses also began to run faster in this period by being able to escape their enemies in the large fields. Examples: Ancestors of the Horse: Merychippus Parahippus Horses are within the Equidae Family. The Equidae family consists of animals such as Zebras, Donkeys, Merychippus and Parahippus and many others. Merychippus and Parahippus were earlier known Horses and helped evolve the horse into what it is today. Merychippus were weaker and smaller than Parahippus and Horses. Merychippus eventually evolved becoming stronger and broader animals called Parahippus. As Parahippus got stronger, the modern day Horse was then evolved. Horse Adaptations Modern Horse Earlier Species Leaf Eating- Horses teeth have very narrow roots with small holes for their blood supply and nerves. Grazing Horses- Horses teeth have an open root with many blood vessels which supply the teeth with lots of nutrients so they can keep growing during their entire life. Larger and Broader More Muscular Smaller and Weaker Can't run as fast Similar neck and bone structures Population Trends: Ten countries in the world have a horse population over a million. The total horse population in the world is estimated to be around 58 million. Today horses are in almost every country in the world used mainly as transportation. As it is possible any species can become extinct, scientists say because horses are so well bred, they are unlikely to become extinct anytime soon. Environment Conditions and Evolution: Horses evolved mainly because of warm climates. Early horses lived in thick swampy forests. When the warm climates came and wiped away their forests, horses evolved to grazing in open fields, changing their tooth structure and hooves. These open fields let horses run freely. Horses then became great, fast runners. Running made these horses a lot stronger changing their muscular structure. Evolution Changed Horses tooth structures, hooves and muscles. Modern relatives of Horses include Donkeys, Zebras, Mules, Ponies and Camels. Donkeys have adapted from Pliohippus. Zebras also adapted from Pliohippus gaining stripes and different types of hooves. This timeline shows how Horses evolved and grew into the modern day Horses we know today. Horse Timeline and Adaptations: Source: http://creation.com/horse-evolution
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