B - Iguanas need to bask in UV light. Without UV, your iguana cannot make vitamin D3, and she will become sick. Vitamin D3 helps your iguana's body use the calcium from her food. C - Younger, smaller iguanas have many enemies. Being able to lose its tail gives an iguana a chance to escape.
Tails can grow back, but they are never as pretty as the original.
Like most reptiles, iguanas lay eggs. The eggs have a leathery shell. If the female has not mated with a male, the eggs will be infertile. That means that they will not have babies growing inside, and they will not hatch.