Evolution

The main mechanism in which populations change over time is through natural selection. This process involves individuals with advantageous traits that help them survive and reproduce passing those traits on to their offspring, leading to an increase in the frequency of those traits in the population over generations.

phylogeny

"genesis and evolution of a phylum," 1872 (in Darwin), from Ger. Phylogenie, coined 1866 by Ger. biologist Ernst Heinrich Haeckel (1834-1919) from Gk. phylon "race" + -geneia "origin," from -genes "born."

Charles Darwin is the most famous scientist who developed the theory of evolution through natural selection. His work, "On the Origin of Species," revolutionized our understanding of how species evolve and adapt over time.

Answering a question can be done by simply stating your opinion on an issue or by giving what you believe to be the proper answer. A science inquiry on the other hand requires you stick to established scientific methods of inquiry (read available scientific literature on the issue, find out what scientific consensus currently is, take into account credible alternative hypothesis, do scientific research, etc.) and the outcome of scientific inquiry does not necessarily have to coincide with what your opinion on the issue was before you started the inquiry.

Evolution and development are both processes that involve changes over time. Evolution occurs at the population level, leading to changes in species characteristics over generations, while development refers to the individual growth and changes that occur during an organism's lifetime. Both processes involve adaptation and can be influenced by genetic and environmental factors.

The act of unfolding or unrolling; hence, in the process of growth; development; as, the evolution of a flower from a bud, or an animal from the egg., A series of things unrolled or unfolded., The formation of an involute by unwrapping a thread from a curve as an evolute., The extraction of roots; -- the reverse of involution., A prescribed movement of a body of troops, or a vessel or fleet; any movement designed to effect a new arrangement or disposition; a maneuver., A general name for the history of the steps by which any living organism has acquired the morphological and physiological characters which distinguish it; a gradual unfolding of successive phases of growth or development., That theory of generation which supposes the germ to preexist in the parent, and its parts to be developed, but not actually formed, by the procreative act; -- opposed to epigenesis., That series of changes under natural law which involves continuous progress from the homogeneous to the heterogeneous in structure, and from the single and simple to the diverse and manifold in quality or function. The pocess is by some limited to organic beings; by others it is applied to the inorganic and the psychical. It is also applied to explain the existence and growth of institutions, manners, language, civilization, and every product of human activity. The agencies and laws of the process are variously explained by different philosophrs.

The model for the slow ongoing process of evolution is called gradualism. It suggests that evolutionary change occurs gradually over long periods of time through the accumulation of small, incremental changes in populations. This contrasts with punctuated equilibrium, which suggests that evolution occurs in short bursts of rapid change followed by long periods of stability.

Potential causes of microevolution include mutations in DNA, gene flow between populations, genetic drift (random changes in gene frequency), natural selection (favoring certain traits), and changes in environmental conditions. These factors can lead to changes in allele frequencies within a population over time.

Analogous organs are similar in function and structure but evolved independently in different lineages. This suggests that these organs have adapted to similar environmental pressures, leading to their convergence over time. This supports the idea of evolution, as it demonstrates how organisms can evolve similar traits to better suit their environment.

In Darwin's theory of evolution, over-reproduction means that organisms tend to produce more offspring than can survive in their environment due to limited resources and competition. This leads to a struggle for existence, where only the fittest individuals with advantageous traits are able to survive and reproduce.

Radioactive dating helps determine the age of fossils and rocks, providing a timeline of when different species lived. By comparing the ages of different fossils and rocks, scientists can establish the sequence of evolutionary changes and patterns of speciation over time, supporting the theory of evolution.

Speciation is the process by which new species evolve from existing species. It is necessary for creating and maintaining biodiversity in ecosystems. Without speciation, organisms would not be able to adapt to changing environments and ultimately survive.

In evolution, fitness refers to an organism's ability to survive and reproduce in its environment. It is a measure of an individual's genetic contribution to future generations. Individuals with higher fitness levels are more likely to pass on their genes to offspring, leading to evolutionary changes within a population over time.

Micro evolution refers to small-scale changes in gene frequencies within a population over a short period of time, while macro evolution involves large-scale changes that result in the formation of new species over long periods of time. Both processes involve genetic variation and natural selection, but the difference lies in the scale and time frame of the changes observed.

You are an example of human micro-evolution as the population of humans has changed allele frequency over time. Micro-evolution is just evolution; change over time.

Radioactive dating helps scientists determine the ages of rocks and fossils, which provide a timeline of Earth's history. By comparing the ages of different fossils and rock layers, scientists can trace the evolution of species over time. This timeline of evolution is a key piece of evidence supporting the theory of evolution.

Evolution is considered a scientific theory because it is supported by a wide range of evidence from various scientific fields such as genetics, paleontology, and comparative anatomy. The theory of evolution explains how species change over time through natural selection, a process that has been observed and tested by scientists. It is a well-established framework in biology that helps us understand the diversity and complexity of life on Earth.

Darwin, however, noticed similarities among species all over the globe, along with variations based on specific locations, leading him to believe that they had gradually evolved from common ancestors.

He came to believe that species survived through a process called "natural selection," where species that successfully adapted to meet the changing requirements of their natural habitat thrived, while those that failed to evolve and reproduce died off.

He wrote about the finches he found on other islands away from the main island, although nearly identical in all other ways to mainland finches, had different beaks. Their beaks had adapted to the type of food they ate in order to fill different niches on the Galapagos Islands. Their isolation on the islands over long periods of time made them undergo speciation.

Biogeography, which studies the distribution of species, supports evolutionary theory by showing patterns of species distribution that align with the idea of common ancestry and evolution. Fossils provide physical evidence of species that have existed in the past, showing transitional forms and demonstrating the gradual changes in organisms over time, supporting the concept of descent with modification proposed by evolutionary theory.

The evidence from the fossil record is considered the strongest support for other forms of evidence in evolution. Fossils provide a physical record of past organisms, showing changes over time and the relationships between different species. This evidence complements genetic, anatomical, and embryological evidence to provide a comprehensive understanding of evolutionary processes.

Under natural conditions, allele frequencies can change due to various factors such as genetic drift, gene flow, natural selection, mutation, and non-random mating. These mechanisms can lead to changes in the distribution of alleles within a population over time.

For a scientist to argue that evolution does not exist based on DNA evidence, her findings would need to demonstrate that genetic mutations do not occur, that species do not share common ancestry, and that there is no evidence of natural selection influencing genetic variation over time. This would contradict the vast body of scientific evidence supporting the theory of evolution.

The evolution of one species can impact another through coevolution, where changes in one species drive adaptations in another. This can lead to mutualism, where both species benefit, or antagonism, where one species may be negatively affected. Interactions such as competition, predation, and symbiosis can all shape the evolution of species over time.

Some variation in a species may be a life line for that species if something like a pathogen would attack it and those that are slightly different would have a good change of living while others might not. This is really what evolution is all about.

The theory of evolution tells us that all life came from single cell organisms that over time evolved into the multi-cellular life forms that we see today.

For this theory to work a long amount of time is necessary and mutations that are beneficial to an organism.

Evolution also can't tell us where the material for the first multi-cellular organisms came from. Evolutionists talk about the 'big bang' but again can't explain where the material that went bang came from.