An 1895 textbook called which shapeless one-celled creature the lowest form of animal life?

Which 1890 Ibsen play opens as its title character returns from a honeymoon, disappointed by her marriage? William Painter's 1890s "crown" bottle cap was originally lined with what material? Anthony Hope's 1894 romance was titled "The ___ of Zenda"? Which title of an 1895 novel by Henryk Sienkiewicz is Latin for "Where are you going?" The 1897 "Officer's Knife," with a corkscrew and a second blade, became known by what name? An 1898 Amsterdam exhibition devoted to which Old Master has been called the first blockbuster art show? An 1898 opera by Rimsky-Korsakov concerned which two composers, later rivals in the film "Amadeus"? An 1898 rampage by man-eating lions halted construction of a railway between Mombasa and which body of water?