Answer by Firefly12987. Confidence votes 9. The placenta is completely formed by 10 weeks, by the joining of the decidua basalis (maternal side) and chorionic villi (fetal side). The chorion and amnion are the placental membranes.The Chorion is the membrane furthest from the embryo, and the amnion in the inner layer that is closest to the embryo.nswer by Firefly12987. Confidence votes 9. The placenta is completely formed by 10 weeks, by the joining of the decidua basalis (maternal side) and chorionic villi (fetal side). The chorion and amnion are the placental membranes.
The short ton (also known as net ton) equals to 2000 pounds and used in north america (united states and canada), the long ton (also known as weight or gross ton) is used in the imperial system (UK and some of the other english speaking countries) and defined as 2240 pounds or 1016 kilograms.
Full Answer. In general, 1 ton is said to equal 2,000 pounds, but some countries outside the United States consider 1 ton to equal 2,240 pounds. The 2,000-pound ton is sometimes referred to as a short ton, while the 2,240-pound ton is called the long ton. In comparison, most cars weigh approximately 1/2 ton, and a fully grown elephant can top 7 tons.