(Question)
Q: All cells have voltages across their what? Choices: - display membranes - ribosomes - nuclei - plasma membranes A:
(Answer)
plasma membranes

(Question)
Q: Ice ages, continental drift, and giant meteorites striking earth have caused what phenomenon? Choices: - gravity - waves - depletion - extinction A:
(Answer)
extinction

(Question)
Q: What are secreted into the gi tract by organs of the gi tract or from a nearby gland named the pancreas? Choices: - stomach acid - insulin and pepsin - bile - digestive enzymes A:
(Answer)
digestive enzymes