Quick Answer. According to The Free Dictionary, etiology, also spelled aetiology, is the study of exploration of the cause or factors contributing to something. In pathology, it specifically denotes the investigation into the cause or origins of a disease. Continue Reading.
Pellets deliver consistent, healthy levels of hormones for 3-4 months in. women and 4-5 months in men. They avoid the fluctuations, or ups. and downs, of hormone levels seen with every other method of delivery.
70 Years. PEX has been in use in Europe for more than 20 years, as of the date of publication. However, testing in the industry shows that PEX should last much longer than 20 years. According to Comfortcontrolsystems.com, PEX pipes that aren't damaged by external factors should last at least 70 years.