Plankton is small plants or animals that may be microscopic in size. It floats or drifts in huge numbers in bodies of both fresh and salt water. There are two distinct types of plankton. The first is minute, often microscopic sized plants known as phytoplankton and animal organisms known as zooplankton.Within each plankton type there are many different variations or species.n fact, there are an estimated 5,000 different types of phytoplankton and thousands of zooplankton species. Many zooplankton are the eggs or larvae of larger marine animals that are classified as plankton during the early stages of their life cycle.
The approved medication for this indication is levothyroxine sodium, which is identical to the natural thyroid hormone produced by the body. Examples of brand names for levothyroxine are Synthroid, Levoxyl, and Levothroid. These drugs may also be used in the management of thyroid cancer or other thyroid conditions.
thyroxine The principal thyroid hormone. Thyroxine has four iodine atoms in the molecule and is often known as T4. The sodium salt of thyroxide (levothyroxine) is sold as a drug used to treat thyroid deficiency disorders (hypothyroidism) under the brand name Eltroxin. thyroxine