Quick Answer. In some rare cases, excessive stress causes bleeding between periods. It is more common that another condition is responsible, such as pregnancy, polycystic ovary syndrome, infection, pelvic inflammatory disease or side effects of medication, according to WebMD.
Characteristics of Scientific Research. When researches progress to a certain degree, turning over to think about them in time will contribute to advance their process and make them develop healthily in correct direction. Therefore, let's have a look into the characteristics of our work macroscopically and generally.
View Full Document. Question 9.5 What essential characteristics distinguish a true experiment from other research designs? Experiments, in the field of research are very much different than any other type of research design. The greatest benefit of the experiment method is convincingly establishing causation.