Final answer:
Rickets is the disease caused by a lack of vitamin D, leading to weakened and soft bones.
Step-by-step explanation:
The disease caused by a lack of vitamin D is rickets. Rickets is a condition that affects bone development in children, leading to weakened and soft bones. It is primarily caused by a deficiency in vitamin D, which is essential for the absorption of calcium and phosphorus, necessary for normal bone growth and development.
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