ผู้เขียน: Nikolaj Gertsen

Water purification is the process of removing undesirable chemical and biological contaminants from raw water. The goal is to produce water fit for a specific purpose. Most water is purified for huma …

A miscarriage can be defined as a pregnancy that ends spontaneously before the fetus has reached a viable gestational age. There are two types of miscarriages: sporadic (SM) and recurrent (RM). RM is …