What are the uses of wearing masks in such situations?

What is the use of ZSM-5?

What is the use of 'KO_2' in oxygen masks?

In 1983, the two enzymes responsible for restricting the growth of bacteriophage in Escherichia coli were isolated. What will be the action of these two enzymes in the above situation?

When a horse suddenly starts moving, the rider falls backward. Name and state the law used to explain the above situation.