What is the grammatical name given to who alone knew how to cure lunatics

The development of new inventions in the field of space travel seemed rapid. how does the word rapid function in a sentence?

Explain the process of conflict resolution in the plot line of the story

Which of the following is not a fire safety precaution a; start fires with kindling or other fire starters b: check local regulations and conditions before starting a fire c: clear flammable debris away from fire area d: extinguish all burning embers before leaving