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.
By week 12 of pregnancy, your placenta has all the structures it needs to step in for the corpus luteum and sustain your baby for the rest of pregnancy â although it will continue to grow larger as your baby grows. By the time youâre full-term at 40 weeks pregnant, your placenta will, on average, weigh about a pound.