Humans and fish are not closely related on the outside appearance. Most people would not see how we can share the same features with fish, but scientists do know that these two species share homologous features. Homologous is being in similar structures, and having similar genes indicate species are from a common ancestor, but does not have indicated that these features will work exactly the same. Humans and fish are related in the lineage of chordate because human shared homologous features to fish. Homologous features shared by human and fish enlighten 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 similarity of the bone structures and genetic instruction are modification we have from the original of fish’s bone and gene.
The similarity of the bones of the humans’ hands and bones in fish’s fins is the homologous structure. 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. 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 a thing. Owen started to notice a pattern because he had a wider range of experiences with creatures ranging from...
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...om simple ancient form that already existed for millions of years in development. Human have features that are modified and rearranged in a more recent way, which make us unique. This is not saying we are the only living things that are unique, fish have their own modification that derived from the chordate ancestral. We are living things that cannot make our own food, giant multicellular organisms were enhanced through our bodies by the evolutionary process so that we could survive and reproduce in this planet. We are built to accommodate the environment that we live in. We are not perfect at adapting to our environment, but more like the good enough for now, in other words just the working process of evolution.
Works Cited
Shubin, Neil. YOUR INNER FISH: A JOURNEY INTO THE 3.5-BILLION-YEAR HISTORY OF
THE HUMAN. New York: Pantheon Books, 2008. Print.
Acanthostega had a fish-like tail and gills for breathing under water, this being the aquatic part of it. But at the ends of the arms were “peddle-shaped” appendages, thought to be the first “hands” on Earth. Clack’s discovery proved that some fish had arms and legs in the water. It showed that arms and legs were already evolved before organisms started actually living on land, they were used more for survival than walking. In a sense, the “blueprints” of an arm were already in place.
There is common plan for all limbs: one bone, followed by two bones, then a bunch of little bones, and finally digits. This array of bones is seen in many species including, but not restricted to bats, whales, and lizards. But how do these limbs develop and why do they all look similar? Shubin explains it by conveying that there are certain genetic switches that help assemble who we are. When scientists went looking for this genetic switch in limbs, they found a couple tissue areas in the limbs that allow this body plan to occur. “A strip of tissue at the extreme end of the limb bud is essential for all limb development…This patch of tissue was named the zone of polarizing activity (ZPA).” ZPA allows humans to have opposable thumbs and pinkies. In other organisms, it differentiates the “thumb” side from the “pinky” side. Scientists then wanted to discover the molecule that allowed this changen in the ZPA, the answer is Sonic hedgehog. Shubin points out that every limbed animal h...
He realized that snake embryos had bumps where there should be legs. Which mean they probably evolved from a creature with legs. He noticed that whale embryos had teeth, but adult whales did not have teeth. The most shocking of his embryotic studies involved human embryos. He noted that the human embryos as slits around the neck, the same in fish. The difference is that in fish the develop into gills, and in human the become the bones of the inner ear. This showed that humans must be descended from fish. This led him to the conclusion that all species were somehow connected. He theorized that beginning with a common ancestor, species had changed dramatically over generations. Some species may add new body features, or lose them. He called this descent with
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. Human beings are no exception to biological evolution. Like other organisms around the world, humans have significantly changed over time and have developed all sorts of diverse characteristics.
...o happen. But with the help of fossil evidence we are able to identify common ancestors and evolutionary pathways between species. We also identify oxygen as a major key contribution for life to evolve. Also, through scientific research it has been established that arthropods and chordates have shared genes, leading to the path of vertebrates and human life.
Evolution views life to be a process by which organisms diversified from earlier forms, whereas creation illustrates that life was created by a supernatural being. Creation and evolution both agree on the existence of microevolution and the resemblance of apes and humans but vary in terms of interpreting the origins of the life from a historical standpoint. A concept known as Faith Vs Fact comprehensively summarizes the tone of this debate, which leads to the question of how life began. While creation represents a religious understanding of life, evolution acknowledges a scientific interpretation of the origins of life. The theory is illustrated as the process by which organisms change species over time.
Freshwater fish and saltwater fish are very similar in a lot of ways, but also have differences between them so you can tell them apart. Marine water (saltwater) equals over 96 percent of the water on Earth and over 70 percent of Earth’s total surface. Freshwater is less than four percent of Earth’s total water and is about one percent of Earth’s surface (Freshwater Fish). Interestingly a few species of fish can live in either freshwater or saltwater, but for the majority, they must live in a specific environment. All species of fish used to live in a saltwater environment until certain geological events (earthquakes, volcanic activity, etc.) occurred, creating conditions that isolated groups of fish. The new habitats, included freshwater, and new food sources caused fish to either adapt, or to die (Lohrey).
The two hundred and six bones in the human body produces a lot of blood cells, store important minerals such as homeostasis (storage and release), and also release hormones, which are necessary to life. During body movement, the skeletal system assists by contracting and pulling on bone to produce movement. Although, in the world we all live in today, skeleton symbolizes all kinds of means/significant reasons. From people using it as a symbol for death (Halloween, rituals, etc.), movies, and many other scary things, the real fact is that skeletal system is one of the most body’s most life giving systems. Apart from other living organs such as the skin, eyes, and many more, the bones are the main primary function that carries them all. Bones are sturdy and firm, but each one in our bodies has their own blood, lymphatic vessels, and nerves. Being the fact that the skeletal system makes up our body movements, support, and protection, it also has its
... drawn. What makes us human? Through the examination of human evolution, both biological adaptations and cultural adaptations which are distinct to humans can be recognized. Biologically speaking, humans are unique in that they are bipedal, they have larger brain sizes, and longer leg length. When examining the cultural evolution of humans we have a complex language system, we live in communities, engage in symbolic behavior, and act through emotional impulses. While we are often considered to be superior to all other animals, it is important to recognize that while we are animals, we have very distinct characteristics and adaptations that separate us both biologically and culturally from all other animals.
When these alterations are helpful, they grow to be fixed in a population and can result in the evolution of new phyla. Evo-devo seeks to figure out how new groups happen by understanding how the method of development has evolved in different lineages. In other word, evo-devo explains the interaction between phenotype and genotype (Hall, 2007). Explanation of morphological novelty of evolutionary origins is one of the middle challenges in current evolutionary biology, and is intertwined with energetic discussion regarding how to connect developmental biology to standard perspectives from the theory of evolution (Laubichler, 2010). A large amount of theoretical and experiential effort is being devoted to novelties that have challenged biologists for more than one hundred years, for instance, the basis of fins in fish, the fin-to-limb change and the evolution of feathers.
The small revision and modifications represent the microevolutionary changes and can lead to new species over time. The immense vast and varied diversity of life on Earth, from birds to butterflies, from apes to humans these baffled and bewildered Darwin. Each organism and species alluringly and appealingly acclimatized and habituated to the environment around the them. Prior to Darwin, humans, were not looked upon as a part if the World. Though, humans resembled primates, like chimpanzee and orangutan and had a lot of similarities with the primates, only few of the Naturalists, grouped humans as
Evolution is the complexity of processes by which living organisms established on earth and have been expanded and modified through theorized changes in form and function. Human evolution is the biological and cultural development of the species Homo sapiens sapiens, or human beings. Humans evolved from apes because of their similarities. This can be shown in the evidence that humans had a decrease in the size of the face and teeth that evolved. Early humans are classified in ten different types of families.
The second thing from a physical perspective that makes us human would be our genes. Genes are the basis for any life
Without evolution, and the constant ever changing environment, the complexity of living organisms would not be as it is. Evolution is defined as a process that results in heritable changes in a population spread over many generations (8).Scientists believe in the theory of evolution. This belief is based on scientific evidence that corroborates the theory of evolution. In Figure 1 the pictures of the skulls depict the sequence of the evolution of Homo-sapiens. As the figure shows, man has evolved from our common ancestor that is shared by homo-sapiens. The change of diet of homo-sapiens over time has thought to contribute to the change in jaw structure and overall skull shape.