Earth formed around 4.54 billion years ago by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean; but the atmosphere contained almost no oxygen and so would have been toxic to most modern life including humans.
Euthyroid is the state of having normal thyroid gland function. Examples of a nonfunctioning thyroid gland may be hypothyroidism, hyperthyroidism, or thyroiditis.
Parathyroid glands: Endocrine glands whose hormones regulate the use and function of calcium and phosphorus in the body. Pancreas: The abdominal organ which secretes insulin and glucagon, which control the utilization of sugar, the body's chief source of energy.