(i) it is does not react with water (ii) it reacts violently with water (iii) it reacts less violently with water (iv) bubbles of hydrogen gas formed stick to the surface of calcium

Dialysis is the procedure to remove waste products and excess fluid from the blood, when the kidneys stop working properly. It often involves diverting blood to a machine to be cleaned.

These are saprotrophs and digestion in saprotrophs take place before ingestion. They break down and convert complex organic molecules present in dead and decaying matter into simpler substances outside their body.

To get the diminished image of the candle flame, the object must be placed at infinity.