Embryos a different animal show patterns of similarities. What is the evidence for is it that these animals all have very similar DNA that these animals all have the same physical structures or that these animals evolved from a common ancestor or these animals have linear relationships?
The evidence for embryos of different animals showing patterns of similarities lies primarily in the facts that these animals all have very similar DNA and that they have the same physical structures during their embryonic development. These observations strongly suggest that these animals share a common ancestor and have evolved through similar developmental processes.
Similarities in DNA sequences among different animal embryos provide strong evidence for their common ancestry. DNA carries the genetic information that determines an organism's traits and functions, and similarities in DNA sequences suggest a shared evolutionary history. By comparing the DNA of different animal embryos, scientists can uncover common genetic traits and relationships between species.
Additionally, the observation of similar physical structures during embryonic development provides further evidence for common ancestry. These structures, often referred to as homologous structures, can be seen in the early stages of embryos before they develop into distinct adult forms. For example, fish, reptile, bird, and mammal embryos all exhibit gill slits and tails during their early stages of development. These structures may serve different functions in adult animals, but their presence in embryos suggests a shared evolutionary past.
The concept of linear relationships, or the idea that organisms evolve from a common ancestor and form a branching tree of life, is supported by the patterns observed in embryonic development. The similarities in DNA sequences, physical structures, and developmental pathways among embryos across different animal species align with the theory of common descent, where all organisms share a common ancestor and have evolved over time.
In conclusion, the evidence supporting the similarities in embryos of different animals suggests that these animals have very similar DNA, exhibit the same physical structures during development, and likely evolved from a common ancestor.