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Descent with modification is the passing on of traits from parents to their offspring. This passing on of traits is known as heredity, which is found in the gene of the offspring. The sloth bear passes down the trait of the tan marked o their chest, most commonly a trait passed down. This acquired trait was passed down from generation to generation making the "birth mark" of the sloth bear exist in all sloth bear today.

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Three bears have evolved the most over time are the polar bear, pand bear, and sloth bear. The Ursidea Family includes Polar Bears, Panda Bears, Sloth bears, Brown Bears, Asian Bears, Cave Bears, Spectacled.The Sloth Bear is commonly found in India, Sri Lanka and southern Nepal. The features on the bear are Enlarged ears, a Black coat Fur, and curved claws. They are very Curious animals,  Normally found out during light. Polar Bears live in the Arctic Circle: Canada, Russia, Alaska, Greenland and Norway. They have a white fur coat, deep claws, longer snout, and a back bump. They walk with caution in environment.
Pandas are most commonly located in China, Sichuan, Shaanxi and Ginsu Provinces. They have a black and white fur coat, tough jaws, big paws for climbing.They spend up to 14 hours eating, and sleeps 2-4 hours between meals.

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The Ursidae takes six months to fully develop into a bear. The embryo has fully formed into an animal like shape within eight weeks of beginning embryonic development. The muscles of the body are beginning to function as they still continue to develop. The neural system has also begun to form the pathways throughout the body. There are paws and eyelids that are visual during week eight as well. The time of development, although it seems short, is coming to a close as the last few characteristics will form within a month.

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Darwin's theory includes both natural selection and descent with modification. Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. How each of these theories apply to the bear's change over the course of time. Natural selection keeps the following population of each species reproducing, finding more common traits in the environment in which each bear is living in. Such as the polar bear increasing body fat as they pass down that trait to their offspring. This trait allowed the bear species to gain the body fat, in order to keep their warmth in the weather conditions that they live in.

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The polar bear have specific genes that allows them to withstand the harsh weather conditions. The most important genes in the polar bears is known as APOB, this makes a protein which is part of a molecule called Low Density Lipoprotein (LDL). It is a large molecule made of a protein and lipids commonly known as cholesterol. The APOB gene protein is important to the process of transporting lipids in the blood. This allows the bears to keep warmth in the freezing cold temperatures, and to maintain a consistent body temperature.

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Punctuated Equilibrium is the hypothesis that evolutionary development is marked by isolated episodes of rapid specialization between long periods of little or no change.  The evolutionary method is Divergent, is it the species tending to be different or develop in different direction. A way prove that bears have evolved is through isolation. By isolating there selves in different geographical locations they are prone to make adaptations to the environment. For instance the polar bear's fat increased as they were most commonly found in a colder climate. Evolution has also occurred throughout a genetic drift. Genome have shown that polar bears are distinct and genetically homogeneous in comparison to brown bears These analyses have also revealed that the polar bear's polar bear genomes appear to be devoid of brown bear ancestry, suggesting the presence of a barrier to gene flow in that direction. into the population of brown bears polar bear genomes appear to be devoid of brown bear ancestry, suggesting the presence of a barrier to gene flow in that direction.

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You can see the drastic changes that have occurred in the bear over hundreds over years ago. Many of the changes are featured in the structures, or physical changes. The structure of the face has changed based upon the jaw. The jaw has evolved because of the food that they are consuming. The claws has developed a change because of the environment atmosphere around the bears. It has more of a flat like feature that was once had a rounder curve. Brown bears hibernate in cold weather. This adaptation helps them to survive in winter when food is hard to find. They have strong arms and claws. This adaptation helps them to dig for food in logs and dirt. Their claws are sharp and curved. This adaptation helps them to catch fish.

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In the ursidae family carries a total of  37 paired chromosomes, including the sex chromosome. Which can be determined that all bear species evolved into different species based upon their geographic location. The mtDNA of extinct Irish brown bears is particularly close to polar bears. The sloth bear shows evidence of having undergone a convergent evolution similar to that of other ant-eating mammals. These species all came from one ancestor that eventually evolved into the bears that we have today. There are two sex chromosomes found in the ursidae family, similar to what is found in many other species like the humans. In the comparison above, humans carry two sex chromosomes as well,  that have the same amount of chromosomes that is found in the human body.

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Pandas have special genomes that gives them a strict diet on what they can and can not eat. The panda genome gives clues to understanding the panda’s strict bamboo diet. A genome is the haploid set of chromosomes in a gamete or microorganism, or in each cell of a multicellular organism.  Pandas have mutations in two copies of a taste gene called T1R1, which encodes a protein that senses the savory taste of meats, cheeses, broths and other high-protein foods. These mutations may have robbed pandas of the ability to taste meat, pushing them toward their bamboo diet.

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Over the course of time the bear's characteristics have evolve, changing they appear. The noticeable changes of the ursidae evolving are it's claw shape, jaw structure, back hump, and the length of snout. These characteristics allow these omnivores to successfully hunt as well as stay alive. The claws depends on where they are located as well as what they eat, same goes for jaws. If they eat more bamboo like the panda, all bears would have the same strength in their bites. The Sloth bear has more of a curved shaped claw specialized for digging, compared to a polar bears that are flatter based upon its environment, and unwillingness to break through the ice.