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.
Best Answer: Breeding. Gopher tortoises usually mate during April and May. Shortly after mating, the female lays between three and 15 eggs, either in a sandy mound in front of her burrow or a nearby sunny place. The eggs mature and hatch from 70 to 100 days later. The hatchlings spend much of their time in their mother's burrow until they're old enough to dig their own. They don't reach maturity until they are between 10 and 15 years old, when their shells are about 9 inches long.