Evolution

As stated, in a punctuated fashion. Organisms can be in stasis, adapted well to their environment for long periods of time, but can undergo rapid evolutionary change ( rapid in the geological sense ) with the proper environmental selection pressure.

Only natural selection could be the answer here as natural selection is the main driver of adaptive change leading to evolutionary change and speciation in large populations.

The concept of gradualism. Also called uniformtarianism.

If ALL offspring are Aa, The parents are AA and aa.

The primary difference between Darwin's and Lamarck's approaches to evolution (if I remember correctly) was that Darwin believed that evolution operated primarily through breeding and death: members of a species that have unproductive characteristics tend to die early and have less opportunity to produce offspring, and so their characteristics are not passed on to future generations. Lamarck, by contrast, thought that environmental conditions could exert a direct (if slight) influence on the genome, so that parents would tend to produce offspring that were better suited to the environment they lived in. For example, Darwin would explain the thick fur and subcutaneous fat deposits of cold-climate animals by saying that members of the species with less fur and fat would die more easily and earlier in cold weather; Lamarck would explain the same result by saying that the cold climate induced the organisms to produce more fur and fat, and their offspring would be born with a greater capacity to produce those things than their parents. Lamarck's theory has not been disproved - scientists still do not have a clear understanding of the process of evolution - but for various non-scientific reasons it is less accepted in the scientific community (primarily, I think, because it opens the door to a teleological argument abut the nature of species that most scientists find distasteful). It is important to point out that Darwin's theory was that of Natural Selection and The Origin of Species, and he was not proposing any system separate from or one that discredited classical Creationist theory. Jean-Baptiste Lamarck, however, coined the phrase Evolution.

Darwin presented exstensive evidence from many areas of biology to support his ideas

Homoygotes for one allele are favored over all others.

well, First off...

Its a THEORY we evolved from apes. Repeat, theory. there is no evidence we did.

Why Haven't We Evolved Further?

Because a species evolves when it needs to adjust to its environment But when the environment slowly changes, evolution comes in and the animal evolves to adapt to the new environment

So, if we haven't evolved anymore, then we are adapted and we don't need change.

EDIT: A scientific theory, which is based on a collection of hypothesis, which is gained through observation and EVIDENCE. You are incorrect to say there is no evidence for evolution, there is a vast amount to support it. You ought to look up what it means to be a scientific theory, and why Evolution is considered to be one. It is one of the most common misunderstanding that I see in relation to evolution.

We did not evolved from the apes of today, humans and the apes of today SHARE a common ancestor, which is to say that we evolved from another ape (homo erectus). The process of evolution takes so long that it can not be observed, we are talking 100's of thousands of years. This is why you don't see the changes, simply because they occur over a large amount of time, little by little.

The apes of today are as evolved as they need to be in order to survive in their habitat, and is why they don't share the intelligence that we humans do. We evolved to best suit our survival.

To finish up, we are evolving through natural selection. The most suitable genes are past on to future generations. As I said before, it's impossible to observe this since it takes such a long time to notice a change.

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We all have wisdom teeth right? notice how they come in later in life?

Why?

Because we USED to use them years ago. when we ate more meat. We needed those extra molers to chew and grind our food. now, people are being born without their wisdom teeth. How? Why? Evolution. our bodies are registering that we don't need them. So, we aren't born with them.

You APPENDIX too. We used to need that. for when we ate lots of plants. Now, we don't eat as much. So now it just sits there. it does absolutely nothing.

some people say well people are being born with more than 2 arms and legs. this must be evolution!! No... Its called a mutation. it happens wen your just born with it. but, they usually don't pass the gene.

Look up natural selection. explains alot. hope i helped.

Knowledge to the structure of DNA.

Aristotle came up with the first theory about life on Earth and he believed that species were fixed creations arranged by their complexity, and those ideas alone lasted for 2000 years. Lamarck later discover that change occurs over a long period of time and he discovered that in the early 1800s. Finally, in 1859, Darwin published his book about his theory of evolution (On the Origin of Species by Natural Selection.) This encompassed his findings from his voyage on the HMS Beagle in 1831-36 on divergent evolution of finches on Galapagos Island and also his research in Australia.

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Evolution, of course. Evolution can happen without natural selection in some cases; drift, flow.

Generally though, natural selection causes evolution and then, by definition, would come first.

Evolutionary biologists do not believe humans descended from apes.

the answer is in page 497 starts where it says over several and ends where it says isolated population...

Here is the answer more specific..... It contributes because isolated groups may experience different environments then other species somewhere else where so they will have to adapt to there environment to survive..for example if you put a bird on one island and a bird on another island farther away with a different environment they are both gonna adapt to there environment and become 2 different species

Good answer but i think mine might be a little more informational. Also i got this answer in the McGraw Hill Glencoe life science book on page 159 bottom left.

Geographic Isolation contributes to evolution because many gene mutations occur. A species has already adapted to that cold environment so that they will change. This will cause the organism to not be able to mate with any other of their old species. This also adds variations to populations. The Key deer, for example, evolved because of geographic evolution 4,000-6,000 years ago. Now the key deer will only be able to mate with other deer that went through the same mutations in geographic evolution.

Using methods such as radioactive dating, scientists can determine the approximate age of a fossil or the rock in which it was found. Utilizing this knowledge of approximate age, scientists can compare progressive fossils, and identify changes. Changes are often minimal, and sometimes organisms do not change at all for large amounts of time, making comparative analysis of fossils a tedious task.

Some eras produced better fossils than others. This can have several causes, such as particularly prolific habitation of environments that more easily produce fossils, general population booms, certain mass extinction events, and even happenstance. Because some eras produce better or more fossils, and some produce few to almost none, the fossil record can sometimes falter. In such cases, scientific investigations may be forced to fill in blanks between species using genetic analysis of preceding and proceeding species or groups within species, if the fossil(s) contain(s) any remaining genetic material. In other cases, computers will be used to recreate images of the species based on fossils, and identify progression between species. In any case, the fossil record is often used as a base off of which to obtain or recreate further information about an organism's evolutionary history.

Lamarck put two ideas into his theory of evolution thought to be true in his time.

1. Use and disuse - people lose characteristics they don't use and keep the other ones .

2. Individuals inherit the traits of their ancestors.

So instead of the environment selecting traits, he said that the species selected the traits.

Adaptability is the answer. Only those species with specific traits that allowed them to quickly adapt to ever-changing circumstances were able to survive, while others were steadily but surely wiped out from existence.

Alopatric speciation. " Other country. "

All organisms need food, water, and shelter in order to live, grow, and reproduce.

Species is a label that is attached to a group of reproductively linked, usually cohabitating organisms. New species emerge from existing species through a process called speciation, which is a result of evolution.

For more information, see related questions below.

1.) Mitochondria and plastids are relatively the same size as bacteria

2.) Mitochondria and plastids have nucleiod DNA molecules - just like bacteria.

3.) Mitochondria and plastids reproduce the same way as bacteria - binary fission.

Darwin was an English Naturalist. His first ideas for his theory came from his trip around the world on the Beagle. His first evidence was when he was in South America and he discover fossils of a form of giant armidillo. They were similar, but not identical to the living armidillos. He also spent some time in the Galopagos Islands where he discovered a type of finch, but they had diffirent varieties of beaks. And he found another finch extremely similar to it in South America. Darwin also had his own experiences with evolution, he was a pigeon breeder. He was also influenced by the following scientist and their discoveries: Jeane Baptiste Lamarck Georges Cuvior James Hutton Charles Lyell Thomas Malthus Darwin then mushed all of his ideas to his theory and worked with a young scientist Alfred Russel Wallace. After Darwin wrote his book. I learned all this in my biology I took in 7th grade.

All evolution that results in increasing genetic divergence between subpopulations may result in speciation. That includes convergent evolution: convergence occurs at the phenotypical level, not at the genetic level.

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There is much evidence that evolution has been at work for millions of years on Earth, as species now exist that did not exist before, while others have died out. The theory is sometimes seen at odds with Creationism when religious beliefs postulate that man and all other living things were created in their current forms.

The opposing ideas are not mutually exclusive, as science has still been unable to define the origin of life - abiogenesis or the creation of life from lifelessness.

However, some evolutionists who are atheistic will continue to argue against God as the Creator, and some religious faithful will continue to argue against evolution (and often all of genetics) as unprovable and false. It is unlikely that the impasse will be resolved to the satisfaction of all involved, at least in the immediate future of the world.