useless trivia: What Word Means: No - None - Nothing?

Questions

A sufferer of leukemia has too many _____?

In 1993 red blood cells were found in the fossilized bone of which type of dinosaur?

what substance is realeased during an allergic reaction?

An oath describing the responsibilities of a physician is known as the________ ____?

The word hysterical may be offensive to feminists, as its root is the latin 'hystera', which means _______?