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A bird's wing a dolphin's fin and a cat's paw are homologous structures How do those structures support the theory of evolution?
When we trace evolutionary history we find that the earliest limbs were the fins of fishes, which became sturdier when fish started to colonize the land, and which then adapted to various ecological niches in the form of a bird's wings, a cat's paws, and a dolphin's fins. Evolution is economical in nature, it always seems to prefer to modify an existing structure rather than creating something entirely new. This is quite understandable in terms of natural selection. Existing strucures will appear in various forms because not all individuals of a given species are exactly the same, and the form that best suits some ecological niche is going to be selected. This makes possible gradual change.
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How do vestigial structures indicate that present day organisms are different from their ancient ancestors?
Vestigial structures are remnants of organs or features that were functional in an organism's ancestors but have reduced or lost their original function over time. The presence of these structures suggests that present-day organisms have undergone evolutionary changes from their ancient ancestors. These structures provide evidence for common ancestry and support the theory of evolution.
How does modern biology support the theory of evolution?
In every way.
What kind of evidence of evolution best support all the others?
Molecular genetics
What are thin coiling structures that support plants are called?
They are the plant's tendrils.
What are the three major areas of evidence for evolution?
The 3 major areas of evolution: homologies, fossil evidence and geographical distribution of speciesA. Homology or similarities between and across species is a key evidence for evolution. The theory goes that species that are related to each other share similarities that were derived from a common ancestor. For example, the forelimb of tetrapods: i.e. the arm of a human, flipper of a dolphin, wing of a bat, and the wing of a bird--reveal similar structures. When compared to a common ancestor such as the Eusthenopteron -- one can see that each aforementioned descendants retains some of the same ancestral characteristics.B. Fossil are remnants of organisms fro past geological times that have been encased in rocks. Through radioactive dating, scientist can determine the approximate age of the fossils. In addition, by examining each stratigraphic levels (rock layers)--scientists can make assessments that for example if an when an organism originated and died out. Comparative studies of fossil records with now-living organisms can be used to show how that organism or related ones evolved over time.C. Different species can be found in geographic regions. Some species can also be found in one region. For example, the flightless cormorant can only be found on the Galapagos Island. Other cormorants found in other regions still retain the ability to fly.
How Does Homologous Structures Disapprove Evolution?
They don't, Homologous structures, such as the bones in your forearms and the bones in your cat's and dog's forelegs are that similar because you and your pets are mammals and closely related on the evolutionary tree. Before modern genetic showed this to be convincing the study of morphology was showing us pretty much the same thing; homologous structures support evolution.
What are the four pieces of evidence that support the theory of evolution?
The four pieces of evidence that support the theory of evolution are the fossil record showing transitional forms, homologous structures in different species indicating a common ancestor, genetic similarities between different species, and observable examples of natural selection in action.
How does homologous structure support the theory of evolution?
Evolution is the process of deriving species from other species, forms from other forms. Homologous structures are structures in organisms that share the same components. A good example is the vertebrate limb - it's clear that our arm, a bat's wing, a dolphin's flipper and a mole's digging paw all share the same identifiable bones. This supports the idea they're all derived from a structure in a common ancestor, as opposed to being created independently.
Why do body structures of some species support Darwin and theories?
Body structures of some species support Darwin's theories of evolution through natural selection by showcasing adaptations that enhance survival and reproduction in specific environments. For example, the presence of homologous structures—similar anatomical features in different species—indicates a common ancestor, demonstrating how species have diverged and adapted over time. Additionally, vestigial structures, which are remnants of features that served a purpose in ancestral species, provide evidence for evolutionary change. These anatomical similarities and differences underscore the gradual process of evolution that Darwin proposed.
How does structure support the theory of evolution?
Evolution is the process of deriving species from other species, forms from other forms. Homologous structures are structures in organisms that share the same components. A good example is the vertebrate limb - it's clear that our arm, a bat's wing, a dolphin's flipper and a mole's digging paw all share the same identifiable bones. This supports the idea they're all derived from a structure in a common ancestor, as opposed to being created independently.
What human part is a bat's wing homologous to?
A bat's wing is homologous to the human hand. Both structures share a common anatomical origin, as they are derived from the same type of limb bone structure. In bats, the elongated fingers support the wing membrane, while in humans, the fingers are shorter and adapted for grasping. This evolutionary relationship highlights the concept of divergent evolution, where different species develop distinct forms from a common ancestor.
Why is emryology evidence of revolution?
Embryology provides evidence of evolution through the observation of similar developmental processes among different species. For instance, many embryos of vertebrates exhibit analogous structures, such as pharyngeal pouches and tail structures, indicating a common ancestry. Additionally, the presence of homologous traits in early embryonic stages suggests that evolutionary changes occur over time as species diverge. These similarities highlight the underlying genetic and developmental relationships that support the theory of evolution.
Why do the body structures of some species support Darwin' s theories?
a cell can make mistakes when it copies what in the dna
How do homologous structures support the theory that many earth species are related?
Homologous structures are anatomical features in different species that share a common ancestry, despite serving different functions. For example, the forelimbs of humans, whales, and bats have similar bone structures, indicating that these species evolved from a shared ancestor. This similarity in structure, despite evolutionary divergence, supports the theory of common descent and suggests that many species on Earth are related through evolutionary processes. Thus, homologous structures provide evidence of evolutionary relationships among diverse organisms.
Birds and bees have wings however these wings are not considered homologies that support evolution. Explain why?
Birds and bees both possess wings, but these structures are considered examples of convergent evolution rather than homology. This is because bird wings and bee wings evolved independently in different lineages to serve similar functions—flight—despite their different anatomical origins. In contrast, homologous structures share a common ancestry, which is not the case for the wings of birds and bees. Thus, while they may perform similar functions, their evolutionary paths are distinct.
Why are vestigal sturctures considered critical evidence of evolution?
Vestigial structures are considered critical evidence of evolution because they are remnants of organs or structures that have lost their original function through the process of evolution. These structures provide insights into an organism's evolutionary history and support the idea that species have changed over time. The presence of vestigial structures suggests that organisms have inherited traits from their ancestors, even if those traits are no longer useful.
How do anatomical similarities support evolution?
Anatomical similarities among different species, known as homologous structures, provide strong evidence for evolution by indicating a common ancestry. For example, the similar bone structures in the forelimbs of humans, whales, and bats suggest that these species diverged from a shared ancestor while adapting to different environments and functions. Such similarities highlight how evolutionary processes shape the anatomy of organisms over time, reinforcing the concept of descent with modification. Additionally, these shared traits can be contrasted with analogous structures, which have similar functions but arise independently, further supporting the idea of evolutionary relationships.
