evolution of polar bear lamarck and darwins theroy
http://www.geol.umd.edu/~candela/pbevol.html http://www.studymode.com/essays/Evoloution-Of-Polar-Bears-Lamarck-Vs-1718444.html http://www.darwins-theory-of-evolution.com/ What is the evolution of a polar bear?
Polar bears have lived in the arctic for many years. Their bodies have adapted and developed in order for their survival in the polar region. Polar bears are able to live in the deep freeze for many reasons. They have thick fur that keeps in their body heat. They have small ears and a small tail which means they lose less heat. Their paws are so big that they act like snowshoes, and the pads on their feet have an anti-slip skin, which would be similar to sandpaper.
For thousands of years polar bears have lived a great life in the North. The Inuit (a tribe) people have lived with them, hunting them occasionally for food or clothing. There was never any fear that the Inuit would over hunt the polar bears because it was dangerous and the weapons available to them were creative. In more recent times, the polar bears have been sought out by hunters, just not the Inuit who live in the North. They have been over hunted by people looking for the big trophy. Eventually in the 1970s the over hunting was brought under control by the International Agreement on the conservation of polar bears and their habitat. Polar bear number once again began to grow because of this. Though there are many theories surrounding evolution, the two stand outstanding assumptions applying to the change from Brown Bear to Polar Bear are Lamarck’s theory of Use and Disuse, and Darwin’s theory of Natural Selection. The intention of this paper is to compare this theory and decide the most appropriate in relation this event. Charles Darwin simply brought something new to the old philosophy -- a plausible mechanism called "natural selection." Natural selection acts to preserve and accumulate minor advantageous genetic mutations. Suppose a member of a species developed a
Polar bears have lived in the arctic for many years. Their bodies have adapted and developed in order for their survival in the polar region. Polar bears are able to live in the deep freeze for many reasons. They have thick fur that keeps in their body heat. They have small ears and a small tail which means they lose less heat. Their paws are so big that they act like snowshoes, and the pads on their feet have an anti-slip skin, which would be similar to sandpaper.
For thousands of years polar bears have lived a great life in the North. The Inuit (a tribe) people have lived with them, hunting them occasionally for food or clothing. There was never any fear that the Inuit would over hunt the polar bears because it was dangerous and the weapons available to them were creative. In more recent times, the polar bears have been sought out by hunters, just not the Inuit who live in the North. They have been over hunted by people looking for the big trophy. Eventually in the 1970s the over hunting was brought under control by the International Agreement on the conservation of polar bears and their habitat. Polar bear number once again began to grow because of this. Though there are many theories surrounding evolution, the two stand outstanding assumptions applying to the change from Brown Bear to Polar Bear are Lamarck’s theory of Use and Disuse, and Darwin’s theory of Natural Selection. The intention of this paper is to compare this theory and decide the most appropriate in relation this event. Charles Darwin simply brought something new to the old philosophy -- a plausible mechanism called "natural selection." Natural selection acts to preserve and accumulate minor advantageous genetic mutations. Suppose a member of a species developed a