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.
Confidence votes 98. A ton is 2000 lbs, so if you rounded, 1500 lbs equals about 1 ton. The exact answer, however, is .75 or 3/4 of a ton.000 pounds = 4 tons = 3.628739 metric tons   8000 Troy pounds = 3.291428 tons = 2.985934 metric tons   There are also long tons and short tons which would give differen â¦ t answers. 8 people found this useful. Scorpio 10.