a) (10 points) Prove that the following grammar is ambiguous:

Opium is considered the prototype for which of the following drug responses?

What is the minimum nicotine dosage considered to be fatal in human beings?

A beverage that is 60% alcohol by volume is what proof?

Fermentation begins when what substance is dissolved in water and exposed to air?

What kind of relationship occurs when a later event alters those preceding it?

Why do marijuana plants that grow in warmer climates have more psychoactive potency?

Ayahuasca is thought by some native South American tribes to produce what effect?

Scalability in reliable multicasting is a hard problem to resolve in distributed systems. Compare between the common two schemes: Nonhierarchical Feedback Control and Hierarchical Feedback Control. In your comparison, comment on the efficiency of each scheme in solving the problem.

Tom is unable to forget his