No, b) a common ancestor.
Homologous structures.
vertebrate means with a backbone so frogs are vertebrates and amphibiansAmphibian.vertebrate means with a backbone so frogs are vertebrates and amphibiansAmphibian.
Similar features in organisms that do not share ancestry means both organisms adapted to their environment. They developed the features to survive.
Animals with bones are called vertebrates. Vertebrates have a backbone or spine that supports their body structure and enables movement. Examples of vertebrates include mammals, birds, reptiles, amphibians, and fish.
jawless fish
descended from a common ancestor
Homologous structures are features that originated in a shared ancestor, such as the bones in the limbs of vertebrates. These features may have different functions in modern organisms but have similar underlying structures due to their common ancestry.
No, b) a common ancestor.
Scientists believe this because they have a similar body model.
what is Similar structures that related species have inherited from a common ancestor
The similarity in the number and location of bones between many fossil vertebrates and living vertebrates supports the concept of evolutionary relationships and common descent. This evidence indicates that vertebrates share a common ancestor, and the similarities in their skeletal structures can be attributed to evolutionary adaptation and divergence over time. Such patterns are foundational to the theory of evolution, illustrating how species evolve while retaining underlying anatomical traits.
Fossils of vertebrates are similar to the bones of living vertebrates because they were once part of living organisms that shared similar anatomical structures and functions. Over time, the bones of vertebrates have undergone evolutionary changes, but many core features have been conserved due to their essential functions. This similarity allows paleontologists to make informed comparisons and infer the evolutionary relationships between ancient and modern vertebrates.
The earliest vertebrates were probably similar to lampreys or hagfish.
homologous structures
These are similar structures that animals may share in early development that come from a common ancestor. For example, if you were to take a look at chickens and turtles still in an egg, believe it or not they would look quite similar.
The opposite would be descendent. A synonym might be forefather.