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Evolution

The scientific theory according to which populations change gradually through a process of natural selection.

5,264 Questions

What types of evidence is are there for evolution?

The most obvious evidence is that we can observe evolution happening before our very eyes. There are many examples of this, and many experiments have been done and it is shown that beneficial mutations do arise and that organisms do indeed evolve by natural selection.

Artificial selection is strong evidence for evolution. Humans acted as selecting agents and forced non random mating in animals, which resulted in a huge diversity of variations. A good example is the different breeds of dogs, all have been artifically selected for their traits. Taking this further, nature can act as a selecting agent through differential survival and produce non random mating.

Fossil record is a powerful evidence. The sequence of fossils in the sedimentary layers matches what the evolution theory predicted perfectly. There is not a single out of sequence fossil in the fossil record. Also, there are many fossils that show the entire evolutionary process, for example, the evolution of whales from land dwelling mammals, the evolution of horses, and despite popular misconception, the evolution of humans is well documented by fossils.

The geographic distribution of animals is also exactly what we would expect if animals had all evolved from a common ancestor. There are no native mammals in Australia and New Zealand, except for the bat which can fly there, but is unique to marsupial species. Animals on islands differ slightly from the nearest mainland, showing speciation.

Molecular data is by far the most powerful evidence for evolution. Our DNA is 98% identical to chimps, which we share the most recent common ancestor with, and it is slightly less identical to gorillas, and even lessly similar to rats, and even lesser compared to fish, and so on. We can make a tree of life using DNA data with their degrees of similarity, and if we take different proteins and compare their DNA independently, they all agree on the same tree.

I summarized those evidences from The Greatest Show on Earth -- the evidence for evolution, by Richard Dawkins.

According to natural selection physical adaptations that aid an organism chances of survial will be passed on to offspring true or false?

True. Natural selection favors physical adaptations that improve an organism's ability to survive and reproduce, increasing the likelihood that those traits will be passed on to future generations. This process leads to the accumulation of advantageous traits in a population over time.

What is the effect of a bottleneck on allele frequencies?

A bottleneck can reduce genetic diversity by decreasing the population size, leading to a loss of alleles. This can increase the likelihood of genetic drift and limit the ability of the population to adapt to changing environments. It can also increase the frequency of deleterious alleles due to random fluctuations in the small population.

Could humans evolve gills?

It is highly unlikely that humans could evolve gills, as this would require drastic and improbable genetic changes. Humans are adapted to breathe air, and developing functional gills would involve significant alterations to our respiratory and circulatory systems. Additionally, the evolution of such a complex trait would likely take millions of years, if it were possible at all.

What evolutionary process s primarily responsible for the evolution?

Natural selection is the evolutionary process primarily responsible for the evolution of species. It involves the differential survival and reproduction of individuals with favorable traits that help them adapt to their environment, leading to changes in the genetic makeup of populations over time.

What are the theories of the origin of man?

To my limited knowledge of the scientific theory of the origin of man is that at some stage of earth's creation some form of life crawled from the sea. Many years later it became man through various stages of evolution. If one accepts this as being but one theory then one must accept that there are others. Remember that a theory does not contain all truth, but as the term suggests it is but a theory and is likely to change as new evidences are found.

If however one brings God into the equation then one will be bought nearer to the truth, that some power greater than man could organise man from the dust of the earth and put into him his spirit so that he became a living soul. One must also be mindful that the eagerly sought after "Missing Link", that is when the beast eventually became man has never been found.

How do fruits aid in the dispersal of angiosperm?

Fruits aid in the dispersal of angiosperm seeds by attracting animals with their sweet taste and bright colors. Animals eat the fruits and either digest and excrete the seeds elsewhere or drop the seeds while moving. This helps seeds spread away from the parent plant, increasing their chances of germination and growth in new areas.

How is evolution not true?

Evolution is a widely accepted scientific fact supported by substantial evidence from multiple fields, including biology, paleontology, and genetics. The theory of evolution explains the diversity of species on Earth through processes like natural selection and genetic mutation. While some may challenge aspects of evolutionary theory, the overwhelming consensus among scientists is that evolution is a valid and comprehensive explanation for the development of life on our planet.

All of the members of a lineage group could claim to be descended from a common ancestor true or false?

True. A lineage group consists of individuals who trace their ancestry back to a common progenitor. All members of the lineage group are believed to be descendants of this shared ancestor.

Why evolution is a false theory?

Being a theory, evolution (or rather "natural selection") is neither "true" nor "false". A theory is put forward as a possible explanation for a phenomenon that can be observed but not easily explained.

There are many "facts" that are offered as evidence of "natural selection" being a good explanation for the huge variety of life on Earth and for the fact that, undoubtedly, species appeared and disappeared over the course of many millions of years, but not everyone is convinced by such "facts". There are other, alternative theories, such as creationism, lamarkism, or even extra-terrestrial intervention, but I'm afraid they're even less convincing than natural selection.

What will the next human species look like?

Various theoriest have proposed that human head sizes will increases (in order to contain the ever enlarging brain which humans possess), and that fingers will become more dextrous. It is estimated that another few hundred thousand years could pass before there is enough genetic variation to make a subsequent human species distinct enough from our own.

Can a theory be rejected?

Yes, a scientific theory can be rejected if new evidence or observations contradict its predictions or if a more accurate theory is developed. The rejection of a theory is an essential part of the scientific process that helps refine our understanding of the natural world.

Natural selection need in order to take place?

Natural selection requires variation in traits within a population, differential survival and reproduction based on those traits, and inheritance of those traits from one generation to the next. These factors allow for the gradual accumulation of advantageous traits over time.

Theory on the evolution of the state?

Evolution - a unifying principle of biology

The theory of evolution states that modern organisms are descendants of ancient organisms and that modifications accumulated over time explain the apparent changes and differences among modern forms of life. This 'descent with modification' theory was central to Charles Darwin's argument of biological evolution, an idea spearheaded by Jean-Baptiste Lamarck (1744-1829). The idea of evolution proposes that animals and plants can change over time, and are not static forms created at once and independent of each other. Lamarck and Darwin proposed different explanation of how these changes may occur. Darwin's proposal of natural selection has proved correct and evidence from biology, earth science, and cosmology all corroborate the basic mechanism of natural selection.

What is one cause of speciation?

One cause of speciation is reproductive isolation or the separation of the population of a species from other populations so that it can change without keep getting mixed with other populations( and therefore becoming identical to other populations).

How does coevolution differ from evolution?

It doesn't. Co-evolution is simply a special case of evolution in which two or more species affect the direction of one another's evolution. The classic example is predator/prey interaction. All rabbits are variants and all fast rabbits vary among themselves also, with the faster ones surviving to reproduce ever faster rabbits. ( within physical limits and incrementally; think of how humans have shaved time off the mile run in the last 50 years ) This drives the evolution of faster, within limits, predators to chase these rabbits. Thus you get a arms race of coevolution in two interacting organisms.

Charles Darwin and his contribution to science?

Charles Darwin was a British naturalist known for his theory of evolution by natural selection, which explains how species evolve over time. His work on the origin of species revolutionized the field of biology and has had a profound impact on our understanding of the natural world. Darwin's contributions laid the foundation for modern evolutionary biology.

What are the products of evolution?

The products of evolution include the diversity of species, adaptation to environments, and the development of complex biological structures and functions. Evolution also leads to the formation of new species through the process of speciation.

Related organisms become less alike by preditation adaptation convergent evolution or divergent evolution?

Related organisms become less alike by divergent evolution, which occurs when two different populations from the same ancestor evolve in separate directions, leading to different traits and characteristics. Over time, natural selection causes these divergent traits to become more pronounced, resulting in greater differences between the populations.

How do you know that a certain matter is a living thing or an organism?

Living things exhibit certain characteristics such as growth, reproduction, response to stimuli, and ability to obtain and use energy. These characteristics help us distinguish living organisms from non-living matter.

What are the Differences between creation hypotheses and the theory of evolution?

Evolution is science and based on the best evidence available. Creation is religion and is part of so many different cultures that I am not sure which story you mean.
The Theory of Evolution by Natural Selection explains much about the fact of evolution (things change over time) and is supported by massive amounts of evidence from both microbiology and the fossil record. There is no 'theory' of creation (creationism) because to be a theory it needs to be able to be testable and be able to make predictions, and creationism does neither of those. Most religions have their own creation myths and the differences between them are astounding. Creationism (also called "the theory of creation" "Creation Science" and "Intelligent Design") have also been disproven for over a century.

Does evolution happen on a genetic level?

Yes, evolution occurs on a genetic level through changes in the frequency of genetic variations over successive generations. These genetic variations can lead to changes in an organism's traits that can be passed on to offspring, driving evolution.

How do people know evolution really happens?

Because evolution is the change in allele frequency over time in a population of organisms and this is easily seen in population gene sequencing.

This does not even mention fossils, genetics, developmental biology, geology and myriad other disciplines that support the fact of evolution.

See related links for details.

Who was the first person or people on earth?

In the broadest sense, there was no "first person", even if we only ask who was the first person who was a modern human, a member of Homo sapiens. This is because we could not say definitively that this person was finally a Homo sapiens,but that his or her parents were still Homo erectus. Evolution is simply too gradual for such simple answers. What we do know is that the first Homo sapiens evolved over two hundred thousand years ago.
We could regard our Homo erectus ancestors as people, although not yet modern humans, or even their Homo habilisancestors as people. Many scientists regard their more ancient predecessors as too primitive and too different to really be people in the sense that we usually use the word. So there would be a broad consensus that Homo habilis were the first people on earth.