Therefore, a variety of comparisons can be performed, including differences in gene expression among different groups and/or individuals.
Very fundamental physiological differences between people may be at the root of these different social strategies, Weissing said, including differences in hormone levels and organization of the central nervous system.
They say ecological factors, including differences in habitat and behavior, could isolate subpopulations enough to allow speciation.
Varied poll results can be caused by several factors, including differences in the wording and order of questions, and the timing of the interviewing period.
Europeans have been somewhat slow to embrace online commerce, in large part because of cross-border issues, including differences in taxation and in the quality of shipping.
The Turnbull government's defence white paper raises concerns about "a number of points of friction" including differences between China and the United States over the South China Sea, and calls on China to be "more transparent" about its defence policies.
Exceptional Children's budget will grow to roughly $27 million from $14 million and its staff will more than double to around 420. "There are a lot of things I still have to reconcile, including differences in pay," Dr. Bowling said.
These facts and the insecurities that flow from them inform many of Pakistan's disagreements with the United States, including differences over the need to rein in militancy in the form of Al Qaeda and the Taliban.
Dr. Willett and Dr. Guallar said there could be several explanations for their disparate results, including differences in the fish eaten in the United States and Europe and how the patients and comparison groups were selected in each study.
The report noted several possible causes, including differences in the health of women before they become pregnant, in access to health care and in the quality of health care".
On the contrary, there are lots of other reasons men might earn more than women, including differences in education, experience and job tenure.
