    Ð°Ð½ Obstetrician is a physician who has successfully completed specialized education and training in the management of pregnancy, labor, and the puerperium (the t â¦ ime-period directly following childbirth).n Obstetrician specializes in the care and treatment of pregnant women during their pregnancy, labor, delivery and the postpartum period.
Animal skins were used as sails for the earliest boats and rafts. The Egyptians and other ancient people wove reeds together in mats to make sails, but the Egyptians were also the first to make cloth sails as early as 3300 B.C. Great sailors of the Mediterranean region like the Phoenicians sailed under cloth sails.
Although the umiak was usually propelled by oars (women) or paddles (men), sails--sometimes made from seal intestines --were also used, and in the 20th century, outboard motors.il, usually from seals would be used to coat and waterproof the seams. A large umiak, 9.1 m (30 ft), would require about seven skins which would be sewn together, stretched over the frame and allowed to dry. Modern versions are essentially identical with the exception of using metal bolts and screws.