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Chondrichthyes are proof of descent with modification because they have developed characteristics like their skeleton, skins and fins. These are only a few of characteristics that have made them thrive and survive in their environments. Chondrichthyes are proof of stabilizing selection because this class has many similar characteristics in different species. It is an example of stabilizing selection because the organisms in its class are still surviving.

https://chondrichthyesblog.wordpress.com

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One example of genetic drift is the great white shark. The great white shark is an endangered species because of how small the gene pool is. Since the gene pool is small genes are not being produced making the species more vulnerable to a disease or extinction. When there is a smaller amount of genes it can not protect itself from future dangers.

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The Great White Shark uses Immigration to receive more genes because new sharks are introduced to each other creating a bigger gene pool. Creating more genes, creating sharks that are a better fit for the environment. This causes the shark to evolve and thrive in certain circumstances.

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The class Chondrichthyes is one example of divergent evolution. Chondrichthyes diverged from the class called Ostereich, also known as bony fish, about 400 million years ago.

http://www.supportoursharks.com/en/Education/Biology/Evolution.htm

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Chondrichthyes went through gradual equilibrium. Some examples are their cartiledge skeleton and denticle skin. These features have helped them survive in the environment. It is proof of gradual equilibrium because their ancestors developed these traits and it made them succeed, passing it down through genes keeping the class from going extinct.

https://chondrichthyesblog.wordpress.com

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Chondrichthyes go through gradual equilibrium. One example is their cartilage skeleton and denticle skin. It helps them survive in their environment. These traits have made them flourish and kept them from becoming extinct. Their ancestors produced this trait and it helped them thrive, causing them to pass it down through the genes.

Chondrichthyes went through coevolution.

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Evidence of Evolution: Anatomy and Physiology 

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Evidence of Evolution: Anatomy and Physiology 

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Evidence of Evolution: Chromosomal Analysis

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Evidence of Evolution: Chromosomal Analysis

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Evidence of Evolution: DNA or RNA Analysis

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Evidence of Evolution: DNA or RNA Analysis

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The Class of Chondrichthyes have common characteristics of the following:

Jawed Vertebrates

Pectoral fins

Teeth made out of calcium

cartilaginous Skeleton

two chambered heart

paired nares

paired fins

most are carnivores and feed on living prey

use of claspers for reproduction

division based on sex and dominance

placoid scales

http://vertebrates.voices.wooster.edu/chondrichthyes/