Name two defiiency diseases associated with deficiency of vitamin - D.

Explanation

**Step-by-Step Solution:**

1. **Understanding Vitamin D's Role**: Vitamin D is essential for maintaining healthy bones. It helps the body absorb calcium and phosphorus from the diet, which are critical for bone health.

2. **Identifying Deficiency Diseases**: When there is a deficiency of Vitamin D, it can lead to several health issues. Two well-known deficiency diseases associated with a lack of Vitamin D are:

- **Rickets**: This disease primarily affects children and is characterized by the softening and weakening of bones, which can lead to deformities. It occurs due to insufficient mineralization of the bone matrix.

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