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Answered 2010-10-19 04:00:41

The greatest natural cause for change in pH in a stream is the seasonal and daily variation in photosynthesis. Photosynthesis uses up hydrogen molecules, which causes the concentration of hydrogen ions to decrease and therefore the pH to increase. Respiration and decomposition processes lower pH. For this reason, pH is higher during daylight hours and during the growing season, when photosynthesis is at its peak.

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Natural selection doesn't reduce variation. Variation is regulated by the rate of mutation.Natural selection reduces the chance of bad variation from being passed on and increases the chances for good variation to be passed on.


Natural selection acts on phenotype variation.


1. Theories don't produce natural phenomena: they describe them. 2. Natural selection does not produce variation; in stead it filters variation.


Genetic variation in itself does not 'support' natural selection: it is what natural selection acts upon.


No, natural selection works on that genetic variation presented to it.



The genetic variation is the grist to the mill of natural selection. This variation is what is selected against the immediate environment and the variation can confer some slight survival and reproductive advantage.


Variation in the terms of genetics is the variation in alleles. Genetic variation comes about by mutation and is important for natural selection.


1) overproduction 2) variation 3) inherited variation 4) natural selection


Natural selection selects from reproductive variation to cause the adaptation of populations to their circumstances.


The best variation allows that species to do the best.


the variation of shoe size is natural


FACTORS AFFECTING NATURAL VEGETATION1) Variation in the amount of rainfall.2) Variation in relief.


Simply variation. Addition Without variation how can you have combination of different traits and therefore natural selection.


Genetic variation. If there were no variation in the genes/phenotype then natural selection would have nothing to select from.


The number 6 is not a natural number on the pH scale if that is what you mean. In fact the number 7 is a natural and neutral number on the pH scale ( on the pH scale number 7 is a green colour.)


The Ph. value of diesel fuel varies depending on its temperature and if its in its natural state or altered. In its natural state the Ph. level is 7.


Variation?!?! That was an obvious observation of naturalists that opposed Darwin's concepts totally. Unless you mean the heritability that leads to variation? Explaining that variation was the problem. Creationists of the time explained this by positing god's whimsy in designing his species, but this was shown to be nonsense as natural processes are at work in variation and this can be shown experimentally. The concept of natural selection explained how that natural variation was selected on beneficial traits. What Darwin did not understand is how that variation was passed on to progeny. His explanation was wrong.


Natural rainwater (pH 5 - 6) Milk (pH 6 - 6.6)


Genetic variation is important because it provides the "raw material" for natural selection




variation,overproduction, and competition


They depend on natural variation in traits due to mutation.


Natural selection in volve variation and selection breeding is breeding them



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