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.
Benefits of animal research. Research provides opportunities for scientists to improve the lives of both humans and animals. Many different animals are used for scientific studies, such as cows, dogs, cats, pigs, mice, rabbits and primates. Animals are used in scientific experiments because by using real-life models, scientists are able to gain more knowledge about the animal.