Questions

The logic in the given puzzle is 

4 + 4 = 4 * 4+1 = 4 * 5 = 20

5 + 5 = 5 * 5+1 = 5 * 6 = 30

6 + 6 = 6 * 6+1 = 6 * 7 = 42

7 + 7 = 7 * 7+1 = 7 * 8 = 56

Similarly

9 + 9 = 9 * 9+1 = 9 * 10 = 90.

TRAP has the highest priority

there are 2 types of interrupts external and internal. NMI has highest priority among all external interrupts, TRAP has highest priority among all internal interrupts. 

Para-amino salicyclic acid (PAS) is used in the treatment of Tuberculosis.

Oxygen is the final electron acceptor of cellular respiration.

The one word substitution for Of outstanding significance is monumental which has a meaning of great in importance, in size or any such characteristic.