    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.
The chief improvement in boat making, from the time of the Phoenicians phÅnicians until the first trip of The, clermont was to do away with oars and to use sails. Only it was not until about fifty years before the time Of columbus that oars were generally discarded and [large] 27 boats were propelled entirely by. sails