Across
- 1. naturally present at high levels in the groundwater of several countries and is highly toxic in its inorganic form.
- 4. a biological preparation that provides active acquired immunity to a particular infectious or malignant disease.
Down
- 1. Inflammation of one or more joints, causing pain and stiffness that can worsen with age.
- 2. This practice originated in India
- 3. What do we observe on 7th April every year