Answer to Question 1
Metabolic Bone Disease is caused by an improper calcium/phosphorous ratio in the diet. If a reptile does not have UV lighting calcium will not be absorbed or metabolized in the reptile.
Answer to Question 2
Chameleons require wire mesh cages that allow air flow. They require branches to climb on, plants to hide in, and a water fall with moving water, as well as a UV light and a heat source to keep the temperature around 80F.