Organisms on island clusters were very similar to each other and to nearby mainland species.
descent with modification
Individuals within a population have differences.
Darwin observed variations in traits among individuals of the same species, which he attributed to differences in their habitats and environments. He also noted that these variations could be passed down from generation to generation, leading to changes in populations over time. This observation, along with evidence from comparative anatomy and biogeography, led Darwin to propose the idea of descent with modification, or the process of evolution by natural selection.
Darwin was intrigued by the variations he observed within and among species, along with the geographical distribution of species. The diverse adaptations and similarities in characteristics among related species, combined with the geological evidence of Earth's changing landscapes over time, led him to propose the idea of descent with modification, which later became known as evolution by natural selection.
Darwin studied a diverse range of modern organisms to support his idea of descent with modification, also known as evolution through natural selection. By observing variations within and between species, as well as the process of adaptation to different environments, he was able to build a compelling case for the gradual transformation of species over time. Studying modern organisms provided evidence for the idea that all life on Earth is interconnected through a common ancestor.
Organisms on island clusters were very similar to each other and to nearby mainland species.
Darwin used the phrase "descent with modification" (he didn't use the term "evolution")
Darwin used the phrase "descent with modification" to reflect the unity he perceived in life. He believed that all organisms are related from an ancestral organism through descent. As time passed, the descendants of this ancient ancestor spilled into various habitats all over the world and began to accumulate modifications that fit their specific ways of life.
He explained them in terms of descent with modification, common descent and natural selection.
descent with modification
Individuals within a population have differences.
Darwin observed variations in traits among individuals of the same species, which he attributed to differences in their habitats and environments. He also noted that these variations could be passed down from generation to generation, leading to changes in populations over time. This observation, along with evidence from comparative anatomy and biogeography, led Darwin to propose the idea of descent with modification, or the process of evolution by natural selection.
Darwin was intrigued by the variations he observed within and among species, along with the geographical distribution of species. The diverse adaptations and similarities in characteristics among related species, combined with the geological evidence of Earth's changing landscapes over time, led him to propose the idea of descent with modification, which later became known as evolution by natural selection.
Darwin studied a diverse range of modern organisms to support his idea of descent with modification, also known as evolution through natural selection. By observing variations within and between species, as well as the process of adaptation to different environments, he was able to build a compelling case for the gradual transformation of species over time. Studying modern organisms provided evidence for the idea that all life on Earth is interconnected through a common ancestor.
Darwin used the phrase "descent with modification" in his book "On the Origin of Species" instead of the word "evolution." He used this phrase to describe the process by which species change over time through natural selection.
He mainly studied birds; finches were the main ones he studied.
DNA contains the genetic information that determines an organism's traits. Through mutations and genetic variations, DNA can change over time, leading to differences in traits among individuals within a population. This supports Darwin's theory of descent with modification, as it provides a mechanism for how species can evolve and adapt to their environment over generations.