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.
Brass pipes will last about 40-70 years on average, with great conditions. Plastic pipes come in two variations: CPVC and PEX piping. CVPC piping has a lifespan of 50-75 years while the PEX plastic ruins much faster and lasts only about 40 years or so. These pipes can last (theoretically up to 100 years).