define evolution

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Evolution is the sequence of gradual changes which take place in primitive organisms over millions of years in which new species are produced

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Evolution can be defined as the changes in the genetic composition of a population with the passage of each generation. It can also be defined as the gradual unfolding of the organism from pre-existing organisms through change since the beginning of life.The origin of life is very much associate with evolution.

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Evolution is an orderly change of various forms through a slow but continuous process.

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Evolution can be defined as the changes in the genetic composition of a population with the passage of each generation. It can also be defined as the gradual unfolding of the organism from pre-existing organisms through change since the beginning of life.The origin of life is very much associate with evolution.

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Evolution is change over time. Under this broad definition, evolution can refer to a variety of changes that occur over time—the uplifting of mountains, the erosion of riverbeds, or the creation of new species. The term biological evolution is a more specific type of evolution.

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 Evolution is the change in the inherited characteristics of biological populations over successive generations. Evolutionary processes give rise to diversity at every level of biological organisation, including speciesindividual organisms and molecules such as DNA andproteins.

 

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Evolution:- The transformation of life from simple to complex form is called Evolution.

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Gradual change  in the formation of pri-existing  organismsis called evolution.

or

 

evolution is simply the generation of diversity and the shaping of the diversity by environmental selection.

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Gradual change in the formation of pri-existing organismsis called evolution

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Evolution is nothing but change in time .

Most of the life forms that we see today have arised by changes that has occurred over the time which allow the organism a better survival . This idea was given by CHARLES DARWIN in 1859 in his book The origin of species .

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Evolution implies an overall gradual development of the differentiated organisms from the pre-existing less differentiated organisms over the course of time.

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hope this helps u.................. thumps up.........................

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Darwin and wallace proposed that natural selection is the mechanism by which new species arise from pre existing ones. The theory of Natural selection states that there is "struggle for existence" within a population and variation exists within all population. The continuous competition between individuals for environmental resources creates a 'struggle for existence' and this struggle makes sure that certain organisms would fail to survive or reproduce. This would eliminate less suited organisms and better adapted organisms would survive and pass on their traits to next generation leading to evolution.

Genetic drift refers to the fact that variations in gene frequencies within populations can occur by chance rather than by natural selection. Random genetic drift may be an important mechanism in evolutionary change in small or isolated populations. In a small population not all the alleles which are representative of that species may be present. Chance events such as the premature accidental death prior to mating of an organism which is the sole possessor of a particular allele from the population. For example, if an allele has a frequency of 1% in a population of 1 000 000 then 10 000 individuals will possess that allele. In a population of 100 only one individual would possess that allele so the probability of loosing that allele by chance is much greater.

Just as it is possible for an allele to disappear from a population, it is equally possible for it to drift to a higher frequency simply by chance. Random genetic drift, as its name implies is unpredictable. In a small population it can lead to the extinction of the population or result in the population becoming even better adapted to the environment or more widely divergent from the parental. In due course, this may lead to the origin of a new species by natural selection. Genetic drift is thought to have been a significant factor in the origin of new species on islands and in other reproductively isolated populations.

Classification can play a great role in studying evolution as organisms sharing greater similarity are grouped together and comparing them among themselves and other organisms can result in better understanding of evolution of organism or group of organisms.

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evolution it is a gradual change which results in biodiversity
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Evolution is the unfolding of nature, that brings about orderly changes, resulting in descendants becoming different from their ancestors.
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process by which organism develops and accumulates new features (change in gene) over time
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As per the NCERT, evolution is the generation of diversity and shaping of diversity by environmental selection. 
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Evolution is the modification of species in a population across a generation.

Hope it helps!!!!ll
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Evolution can be defined as the changes in the genetic composition of a population with the passage of each generation. It can also be defined as the gradual unfolding of the organism from pre-existing organisms through change since the beginning of life .The origin of life is very much associate with evolution.
hope it helps
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