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Evolution
The scientific theory according to which populations change gradually through a process of natural selection.
5,264 Questions
The human heart is one example of an tissue or organ?
The levels or organization are: cells -->tissues--->organs--->organ systems--->organism. The heart is an organ of the organ system called the cardiovascular system. This includes the heart, veins and arteries and blood.
Can you compare and contrast gradualism and punctuated equilibrium?
punctuated equilibria accounts for the gaps in the fossil record. Species evolve quickly during relatively short periods. Tiny changes in a species gradually add up to major changes over very long periods of time.
Gradualism proposes that evolution occurs slowly but steadily. These periods of rapid change are separated by long periods of little or no change.
What are the direct evidence of evolution?
Evolution is the change in allele frequency over time in a population of organisms. This is observed and observable. In plant this can be seen in one generation by the process of polyploidy. Where chromosome number can double, for example, in one mating and thus fulfill the definition of both evolution and speciation.
What was the mechanism for evolution according to Darwin?
Survival of the species in a changing environment. A species evolves when its survival is threatened by its environment.
EX: Ho-mo sapiens evolved from primitive hominids by natural selection of those hominids with the larger brains. So gradually the primates acquired larger brains and were better able to survive by out-thinking their predators, including other hominids.
Ho-mo sapiens means "wise man" in Latin.
Why is evolution important to organisms?
It isn't. Evolution is just something that happens where you have populations of organisms. To any individual organism doesn't matter one hoot that its distant ancestor was different than itself, or that its remote descendants will be different again.
How have humans evolved in the last 1000 years?
What are the 5 conditions required for non evolving populations?
1) every large population
2) no emigration or immgration (no gene flow)
3) no mutations: no new alleles added to the gene pool
4) random mating: no sexual selection
5) no natural selection: all genotypes have equal chance at surviving
We often say the theory of evolution when we refer to the idea that life evolved through natural selection.
Note that the theory of evolution, at least as it is expressed in modern evolutionary synthesis, is far and away the bestexplanation for the countless facts we've discovered about life on earth and its long history here. In that light, modern evolutionary synthesis (MES) is considered fact by almost all of the scientific community.
The fact that the ideas expressed have not been proved false does not keep some from trying. And though the questions raised and the contrary opinions expressed are, in general, healthy for science on the whole, there is an undercurrent of desperate intent on the part of some investigators who attack the theory. These exchanges are spoken to in other posts here on WikiAnswers. Links can be found below.
What scientist developed theories on evolution?
Alfred Russel Wallace independently came up with the theory of evolution. His and Darwin's papers on evolution were jointly presented in 1858, and so both are credited with the discovery of evolution by natural selection.
How do you compute the Pharmaceutical evolution index?
ID in pharma talks about Growth of individual brand in relation to growth of a molecule or combination for a particulat period of Time in a .
Like amoxycillin oral growing x percent and Brand aaa Containg amoxycillin growing by y percent.Then ID =Y/D
Trait that improves a species chance of survival?
Adaptation is a trait or structure that improves an organism's chance for survival and reproduction. Benthos is organisms that live on or near the ocean bottom, sometimes attached to surfaces.
What is necessary for natural selection?
External selection forces that make survival hard.
To get the fastest rate of evolution these forces should kill or disable 50% to 90% of the individuals in each generation before they are able to reproduce. But these forces should not kill so many as to make the species go extinct. In most cases these forces only kill or disable less than 10% of the individuals in each generation before they are able to reproduce.
What principle states that living things change gradually over time through natural selection?
The theory of evolution by natural selection.
What did Darwin assert in his book On The Origin of Species as the mechanism of evolution?
Due to genes and mutations, organisms show variation within a species. Changes in the environment can put a selective pressure on the species - certain mutations may be more beneficial, therefore more individuals with that mutation will exist, as they survive and breed. This process is called Natural Selection.
What is Darwin's measure of success in origin of species?
Success in the context of natural selection means reproductive success, or fitness. It refers to the average number of fertile offspring raised by any variant, lineage or population as a whole.
Why are creationist skeptical about evolution?
They are against it because it goes against their beliefs, so they try to prove it wrong but only end up losing.
How does geology provide evidence of evolution?
It isn't. Evolution can in principle be understood without ever referring to geology. Geology can help us understand the specifics of our natural history though. It can tell us about factors in the evolution of species, or it can show us how species were geographically distributed in the past. But geology is not required for evolution - nor is a knowledge of geology required for an understanding of evolution.
What year did Jean-Baptiste Lamarck make his discovery?
He made his dicovery 1815 about the Theory of Evolution
Inclination joint in microscope?
An inclination joint of a microscope is where the arm of the microscope connects to the base of the microscope. Many microscopes have a pin to hold these to objects together. If the microscope is equipped with the pin you can place one hand on the base and with the other hand you can grab the arm and rotate it back and forth. The inclination joint allows the microscope to tilt back for more comfortable viewing. Please note, there is no way to contain liquid specimens if you tilt your microscope back the liquid will spill to the ground or all over.
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What are the Nuclear fuels of one solar mass stars over the course of its entire evolution?
At first, such a star will convert hydrogen-1 into helium-4; later, it will convert helium-4 into heavier atoms, up to about iron.
What characteristic do the members of the four kingdoms of the domain Eukarya have in common?
They are ALL multicellular (many cells).
Why is gene duplication seen as potentially event in evolution of species?
Yes. When a gene is duplicated you have one gene doing the job it was doing before and the possibility of the duplicated gene having a beneficial mutation and picking up a brand new job to do and making a newly beneficial protein. Of course if the mutation is deleterious that organism will not pass those genes on any further than progeny. Remember, only germline mutation are passed on to future generations.
According to the theory of evolution how are humans and monkey's related?
You will have noticed that the great apes are similar in some ways to monkeys, but also similar in some ways to humans. That is because we are more closely related to the apes than we are to monkeys. Humans and chimpanzees share a common ancestor that lived around seven million years ago. This common ancestor was, in turn descended from an even more remote ancestor of all the apes. And, going back even further, there was indeed an ancestor common to both monkeys and apes.
So the evolutionary gap is explained by the remoteness in time of our common ancestor. The process of evolution simply took us in quite different directions.
