Evolution

Similarities in body structure among different species can suggest a common ancestor and evolutionary relationship. These similarities can be explained by the concept of homology, where structures have a common developmental origin despite serving different functions. By comparing anatomical features, scientists can trace the evolutionary history of species and understand how they have adapted over time.

Adaptive change is the province of natural selection and natural selection is one of the main drivers of evolution. Natural selection selects from the individuals variations in a population of organisms on, basically, reproductive success and this adaption is passed on to progeny which changes the allele frequency in the population which is evolution.

Embryology shows the same thing that all other branches of biology and palaeontology show: a strong convergence of phylogenies based on independent assays of traits, both morphological traits at the various stages of development as well as the developmental paths taken by the various organisms. This can only be explained by common descent.

Speciation
Evolution is the gradual process in which already existing species undergoes in order to have a greater chance of survival. Because Natural Selection takes place, random mutations occur in offsprings, and so new characteristics and attributes are formed. These random mutations may occur because they may have a greater chance of survival or because it would benefit them in some way. For example, the giraffe's long neck came about when it found that it needed a way to obtain leaves from the tops of trees. And so, generation by generation, it's neck slowly lengthened until it was able to do so.

Adaptations that better suit an organism's environment can increase its chances of survival and reproduction. Over time, accumulated adaptations can lead to speciation, as populations evolve to the point where they can no longer interbreed and produce viable offspring with other populations. This process is known as reproductive isolation and is a key factor in the formation of new species.

The greatest increase in diversity of life during evolution was likely due to the process of speciation, where one species diversifies into multiple new species over time. This can be driven by various factors such as geographic isolation, genetic mutations, and natural selection acting on different populations.

That all organisms are variations. That there are many more organisms born than can be supported by the available resources. That their is a struggle for existence and some organisms will be better adapted to survive and out reproduce their fellow organisms. That these organisms that do this will leave descendents that have these same characteristics which will change the morphology and behavior in these population of these organisms over time.

Organisms have had approximately 3.5 billion years to evolve and change since the emergence of life on Earth. This long period of time has allowed for the incredible diversity and complexity of life we see today.

One evidence is that both mitochondria and chloroplasts have their own circular piece of DNA that actually codes for a few proteins. This DNA is of the prokaryote type and strongly suggests that the mitochondria and chloroplast were once free living organisms that, one way or another, joined in a symbiotic relationship with a proto eukaryote cell.

This is known as genetic drift. It refers to the random changes in allele frequencies that can occur within a small population due to chance events.

Evolutionary development helps us understand how species have adapted and changed over time to survive in changing environments. It provides insight into the history of life on Earth and helps us make predictions about how species might change in the future. Studying evolution development also has practical applications in fields like medicine, agriculture, and conservation.

The statement that all organisms were created in their current form and have not changed over time is not part of the modern theory of evolution. Evolutionary theory explains that organisms have changed and diversified over time through processes like natural selection and genetic variation.

The great Charles Darwin is most credited with the theory of evolution, but there were many before him that had similar ideas, and many people since have advanced the science of evolution.

The function of evolution is to drive changes in populations of organisms over time, leading to genetic diversity, adaptation to the environment, and ultimately the formation of new species. It allows organisms to better survive and reproduce in their environments through natural selection.

Punctuated equilibrium is thought to be caused by periods of rapid evolutionary change followed by long periods of stability. This can occur due to environmental changes, genetic mutations, or other factors that drive natural selection to favor specific traits or adaptations. The theory suggests that species evolve in bursts when faced with significant challenges or opportunities, leading to relatively stable periods in between.

Natural selection and evolution occur when individuals within a population vary in traits that affect their survival and reproduction. Traits that increase an individual's likelihood of survival and reproduction are passed on to the next generation, leading to the accumulation of beneficial traits in the population over time. This process drives the adaptation of populations to their environments.

Both failed to understand the mechanism of inheritance. Darwin had a mistake " blending " idea and Wallace seemed to go along with this concept, though inheritance is particulate.

Evolution takes place over long periods of time in natural populations in various environments around the world. It occurs through genetic changes in populations over generations, resulting in the accumulation of adaptations that enhance survival and reproduction.

With oxygen the organisms of earth could more efficiently use food because as the final electron acceptor in the electron transport chain oxygen is a main player in the conversion of, say, glucose into many ATP molecules per glucose molecule. Oxygen is the most efficient way to do this compared to fermentation which is anaerobic.

Thus organisms became multicellular and much more complex with energy to become motile to a greater degree than before.

Sexual reproduction leads to variety in the gene pool because the genome of an offspring organism may have a mixture of the genomes of both parents, rather than just the material of a single parent. Evolution in asexually reproducing organisms occurs by mutation, rather than genetic variation, since there is only one parent.

how is natural selection occurring in the pollenpeepers

Evolution is a fact. The theory of evolution by natural selection is what you are trying to talk about.

When someone says " evolution is just a theory " they are using the vulgar, common sense of the word theory. They mean guess, hunch and the like. The theory of evolution by natural selection is in the scientific sense of the word theory, which means a body of explanatory work supported by myriad lines of converging evidence that has been tested rigouusly and replicated often. Any good dictionary uses this scientific meaning of theory as the primary meaning of the word.

Ill posed question.

Since populations evolve and can have many different and changing strategies for survival and reproductive success, some variant within the population, tour question does not make any sense. Evolution is not linear, but branching from many, many points of departure.