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The Similarities Between Humans And Fish

1117 words - 4 pages

Human and fish are not closely related on the outside. Most people would not see how we can share same features with fishes, but scientists do know that these two species share homologous features. These features imply that human and fish are related in the lineage of chordate because human shared homologous features with fish. Homologous features shared by human and fish lighten up the evolutionary pathway from the earliest vertebrate by sharing similar structures of the hands and fins. The development of teeth that diversified into features that showed up from the skin, and down to the instruction that made us who we are. The similar bone structures and genetic made up are just modification that we have and they are modification of what fish had. The facts about our evolutionary pathway are fishier than some of us thought.
The hands that we use to help us grab, grasp, and grip onto things are important to us as humans. Without these hands we would not be able to use tools and hold pencils. Our five fingers are capable of moving and touching one another or by themselves. Shubin pointed out that the hands of the cadavers are the signature that we are what we are because our hands speak of many tasks that we are capable of doing such as building, holding, and creating our reality (Shubin, p.29). The structures of the hands are thought by anatomists such as Sir Charles Bell and Sir Richard Owen because the design was profound. Bell thought that it was the perfect design that only god could create such thing. Owen started to notice a pattern because he had a wider range of experiences with creatures ranging from dinosaurs, which he invented the word for, to gorilla. The pattern that Owen saw was the layout of the bones of the limbs: the arms and legs (Shubin, p. 30). This layout is similar in vertebrate, one bone, two bones, and a lot of bones. So how does this discovery that humans and fish shared homologous limbs structures lighten up the evolutionary path? Take a closer look of why we share the same skeletal layout in our limbs structures with other creatures such as bat, horse, dinosaurs, and many others. In this same section, Shubin included Charles Darwin’s statement that makes it easier to understand. Humans have the same layout as other vertebrate creatures because we all came from a common descent (Shubin p. 32). Finally, the ancient fish, the Eusthenpteron, which we shared this limbs structure with was discovered in Devonian rocks around 380 million years old. It had the exact limbs structure as Owen described, however for this fish, the bones of the limbs were inside a fin (Shubin, p.33). This ancient fish unlocked the mystery that we are derived from a common ancestor that enable us to hold tools to do our everyday life tasks.
Humans spent thousands of dollars going to the dentists so we can keep using our teeth healthy and be able to chew on food that we eat every day. Teeth are earliest development and the lead to many other...

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