In the morphological characteristics, there exists variation between populations of the same species at different life stages and from different environments [29].
Despite the lack of significant relationship between patient outcomes and healthcare provider density, the study also revealed that across service sites there exists variation among these variables.
It is also possible that there exist variations in birth frequency within each county that would selectively affect MS births.
Evidently, there exist variations in the patterns of childhood stunting not only across various regions of the world but also within and between local authorities, regional space dimensions and/or countries.
Moreover, since the larvae were derived from a laboratory culture, it will be important to determine whether there exists variation in these responses in natural populations.
However, there exists variation in the number of fruit flies present per apple.
Despite efforts to standardize PPH care, there still existed variation in the pharmacological agents/regimens used, especially in the administration of second- or third-line therapies.
In both natural and experimental settings, there may exist variations during initial colonization of bacterial populations in a new habitat.
When the network is altered, i.e., a path is added or removed as a result of mutation in Jij, there exists a variation of the order of <img src="http://journals.plos.org/plosone/article/asset?id=info?doi/10.1371/journal.pone.0000434.e010.PNG" class= inline-graphic"/> in the threshold function term in eq.(1).
While some factors could better be controlled, there still exists variation on the uniformity of germination and number of seedlings emerged above the ground.
In actuality, to say that there are genes "for" a particular behaviour means only that within a population of individuals there exists genetic variation underlying some of the differences in this specific behaviour.
