UnScramble this Word: c h o c u?

Questions

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 _______?

Aurora borealis are more commonly referred to as what?