When this happens, the thyroid gland is no longer under pituitary control. The amount of hormone it produces is dependent on levels of TSI. TSI are the direct cause of hyperthyroidism in Gravesâ disease and various immune system chemicals known as cytokines also contribute to the symptoms that occur in this disorder.
Iguanas are reptiles and nearly all reptiles lay eggs. There are some reptiles that do not lay eggs, but they are very rare. Female iguanas usually lay a clutch of eggs every year once they're mature. If there is no male iguana, she will still lay eggs, but they won't be fertile.
Several iguana species are known collectively as rock iguanas, and some are found on just one or two islands. Female rock iguanas lay a clutch of 5 to 20 relatively large eggs each year; the larger eggs result in large hatchlings that evolved in response to the lack of native predators.he smallest of the rock iguana group are the Turks and Caicos iguanas. All eat a wide variety of fruits and serve as important seed dispersers for many native plants. Many think lizards live only in deserts, yet the marine iguanas of the Galapagos GalÃ¡pagos (islands off the coast Of) ecuador are excellent. swimmers