Treatment of hypothyroidism with levothyroxine is effective, but starting doses vary. There are two strategies for initiating levothyroxine in healthy adults younger than 65 years: low-dose (50 mcg) and full-dose (1.6 to 1.7 mcg per kg).
The only good example of this is chalk, which is made from the compacted shells of tiny marine organisms called diatoms. Other than that, animal and plant remains do not tend â¦to form rocks, although the hard parts may form fossils.
The same types of forces also created coal, but there are a few differences. Coal formed from the dead remains of trees, ferns and other plants that lived 300 to 400 million years ago.In some areas, such as portions of what-is-now the eastern United States, coal was formed from swamps covered by sea water.n fact, most of the fossil fuels we find today were formed millions of years before the first dinosaurs. Formation of Coal. Fossil fuels were formed from plants and animals that lived 300 million years ago in primordial swamps and oceans (top).