Prolonged campaigns also involved the difficulties of maintaining a coherent Arab coalition.
There are a couple of ethical questions that shift the argument towards mitigation.One involves the difficulty of doing cost-benefit analysis across borders.
In patterning the TNP, several methods such as solvent-assisted soft lithography[9], micromolding technique in capillaries[10], and imprint lithography[11] have been typically employed, but they involve the difficulty of patterning multiple stacks of the TNP and eliminating the residual layer.
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Moreover, there are ethical issues that are beyond the scope of this paper but involve the difficulty of assigning a monetary value to a human life.
The set-up involves the difficulties of living with women.
For years, efforts to study the microbiome were stymied by the number of species involved and the difficulty of culturing finicky strains in the lab.
The approach has not been widely used because of the time and cost involved and the difficulty of controlling the many variables which influence real world behaviour.
However, demonstrating such impact is scientifically challenging because of the many different factors that are involved and the difficulty of making predictions about the future, as well as politically charged because of the implications any findings will have for public policy and human health.
They've been raised for centuries in many countries, and the great number of varieties, multiplied by the many languages involved and the difficulty of transliterating them, makes for a tangle.
