The primary function of the thyroid is the production of the iodine-containing thyroid hormones, triiodothyronine (T3) and thyroxine (T4) and the peptide hormone calcitonin. 1  T3 is so named because it contains three atoms of iodine per molecule and T4 contains four atoms of iodine per molecule.
David Livingstone was born on March 19, 1813, in Blantyre, South Lanarkshire, Scotland, and grew up with several siblings in a single tenement room.
And in 1815 he did take 38 colonists from America to Sierra Leone, a British colony on the west coast of Africa. Cuffee's voyage seems to have been an inspiration for the American Colonization Society, which was officially launched at a meeting at the Davis Hotel in Washington, D.C. on December 21, 1816.