useless trivia: What Word Means: A Decade - Ten Things?

Questions

Disneyland opened in what year?

Diverse group of either single-celled or multicellular organisms that obtain food by direct absorption of nutrients?

Division of geologic time in the Cenozoic era following the tertiary period (geology)?

DNA analysis suggests there are three distinct species of this animal, African forest, African savanna & Indian. What animal?

DNA stands for what?