Final answer:
Rickets is a childhood disorder characterized by bone deformities due to vitamin D deficiency. It leads to soft, weak bones, skeletal deformities, fractures, and bowing of the leg bones.
Step-by-step explanation:
Rickets is a childhood disorder characterized by bone deformities due to defective mineral-ization of bone. It is caused by a deficiency of vitamin D, which stimulates the intestinal absorption of calcium and phosphate. The symptoms of rickets include soft, weak bones, skeletal deformities, fractures, and bowing of the leg bones.