Compare And Contrast Polar Bear And Arisesthat

Animals fight for survival daily, and sometimes their lives depend on their ability to adapt with their surrounding environments. Natural Selection is the process in which individuals have certain traits that allow

The bear have evolved along time ago and now there is only eight species existing. They evolved from early canids during the late Oligocene and early Miocene, about 25 million years ago. The earliest ancestors where the Dormaalocyon Latouri. An intermediate ancestor was the short faced bear, very similar to the modern day bear. It lived through the pleistocene period. It grew to thirteen feet long and was a herbivore. The ancestors to the modern day bears lived in the same climate and ate the same things. The modern bear contrast from the ancestor because the ancestor was more skinny and was smaller, and it was more cat like. The eight species of bear that still exist. They are the Polar bear, Brown bear, American black bear, Asian

Evolution is the idea of a living organism adapting or mutating to gain beneficial physiological, psychological and structural features. The genetic makeup of all living things is constantly changing, due to DNA replication errors or outside factors, some of these changes impact drastically on the organism changing it for the better or worse. Typically when an organisms genetic code is changed for the better and it reproduces and outlives its unchanged counterparts this process is called evolution.

1. Adaptations- Characteristics that are passed down from parent to child that increases the organism's chance of survival and reproduction in their environment.

The polar bear, the largest land carnivore in North America, one of the largest animals in the world and a favorite at zoos worldwide, has, over the years, adapted to its harsh Arctic environment. The appropriately named ‘ursus maritimum’ or sea bear usually lives between 15 and 18 years in the wild and spends most of its life on ice. It is the most recent of the eight bear species. The first polar bear was a brown bear subspecies, with brown bear dimensions and brown bear teeth. The polar bear evolution was rapid due to the small population and extreme pressure to survive. Even today, the polar bear continues to evolve to better adapt to the harsh realities of Arctic life.

Many species of animals have had to adapt to their living enviroments. Some animals such as anglerfish, have had to go through major adaptations by developing a fishing pole like spine, descending from the middle of it's head. Others such as polar bears have had more of a minor adaptation such as, learning to bury themselves deep into the ground into small chambers. Both polar bears and anglerfish have had to go through many perplex yet astonishing adaptations.

Evolution is the process of biological change by which descendants come to differ from their ancestors. Natural Selection is when an individual with the best trait survive and breed in more population. Larger populations of organisms with the desired traits will then occur and organisms will evolve. The four principles of Natural Selection are variation, over production, adaptation, and descent with modification. Charles Darwin, an English naturalist and geologist saw two major trends within organisms which were variation and adaptation. Variations are differences in individuals’ physical traits compared to other individuals. In the Galapagos Islands Darwin noticed that finches had different beak sizes and shapes. Darwin then concluded that finches with thicker beaks lived in areas where nuts were the main food source and finches with smaller beaks tended to live in areas where insects were the main food source. Adaptation are features that allow an organism to better survive in their environment. There has been many adaptations in animals but one of the best has been living in groups because animals can then “help each other find food, defend against predators and care for their young” (animalpanet, n.d.). Overproduction is when organisms produce more offspring than the environment can support. Darwin stated that all animals over produce since offspring can reach reproduction age and have offspring of their own. For example, “even a slow breeder

According to Darwin and his theory on evolution, organisms are presented with nature’s challenge of environmental change. Those that possess the characteristics of adapting to such challenges are successful in leaving their genes behind and ensuring that their lineage will continue. It is natural selection, where nature can perform tiny to mass sporadic experiments on its organisms, and the results can be interesting from extinction to significant changes within a species.

An adaptation is a result of evolution. They can be structural (physical features), behavioural and physiological (special response e.g. snake producing venom). These adapted characteristics (or mutations) develop for a creature to survive in it’s environment better, which are then passed on to its offspring. For example, the Wolly Mammoth possessed a number of physical adaptations to survive the cold

What is the life of a bear like? Bears have originated in Asia, and slowly evolved in the forest, jungles, etc. across the world. There are eight different species of bears and they can weigh from 100 pounds to 2,000 pounds. The diets of bears are omnivorous; a person or animal that eats food from a plant or animal. Bears have also, almost gone into extinction because their loss of habitats.

The dictionary defines adapt as make fit or suitable; most people define adaptation as a process dictated by one's surroundings. In Antarctica, the Inuit people adapted to use whale blubber as insulation and food. People often adapt to new situations out of necessity. Some people do it because of their environment, government, or social situation.

Adaptations are categorized in three postulates, survival of the fittest, variation, and inheritance. If an animal survives long enough to reproduce, it will pass along its genes that helped it survive to its offspring. Eventually over time, these genes will mutate and most of the species will inherit these adaptations. Charles Darwin coined the term "natural selection" in reference to artificial selection

The Ursus Maritimus, otherwise known as the polar bear, has walked this planet with their massive webbed paws for hundreds of years. They have sustained many different difficulties in life but the most recent issue, global warming, is one that these animals just might not overcome on their own. The polar bear’s population is rapidly dwindling and scientists discuss why exactly we should save these giant white sea bears. There are two different sides to this argument. One side is referred to as the Naturalists. These people believe we need to let nature take its course. They believe we should not interfere, and instead let the animals and the ecosystem work on its own. On the other hand, the Anti-Naturalists believe we must step in and help preserve the polar bear population. They believe that we cannot let the Ursus Maritimus die out for a various array of reasons.

They are very fast. They are also very fast swimmers. They hibernate for a long time. when they are hibernating they give berth. They are hunted a lot but people are starting to stop that.

Adaptationism is the belief that the traits seen in organisms are the results of evolution by natural selection. There are different forms of adaptationism and many different definitions as to what an adaptation is, with some believing it is impossible to test a hypothesis about an adaptation at all. This essay will look at a) how to define adaptation b) different forms of adaptationism and c) consider the different methods of testing whether a phenotype is an adaptation.