The Danube connects with the RhineâMainâDanube Canal at Kelheim, with the Donaukanal in Vienna, and with the DanubeâBlack Sea Canal at CernavodÄ. Apart from a couple of secondary navigable branches, the only major navigable rivers linked to the Danube are the Drava, Sava and Tisa.In Serbia, a canal network also connects to the river; the network, known as the DanubeâTisaâDanube Canals, links sections downstream.he Danube (/ËdaenjuËb/ ËDÃ¦NJUËB-dan, ewb also known by other) names Is 'europe s-second longest, river After volga, river and also the longest river in The European union, region located In central And Eastern. europe
The cells that make up the placenta, known as trophoblasts, are able to convert cholesterol from the motherâs bloodstream into progesterone. Between weeks 6-9 of pregnancy, the placenta takes over from the ovariesas the main producer of progesterone.
Women between ages 35 and 40 have a 20% chance of miscarriage whereas older women of 44 to 50 have nearly a 50% chance for miscarriage. Placental problems seem to increase with age. Placenta pervia is a condition in which part or all of the cervical opening is covered by the placenta.