You are the lucky student of a wacky professor who develops a time machine. He asks if you will test it with him. You get in and there is an immediate glitch-the date readout fails so that when you land you are not sure what era you are in. As your time machine lands, you see an unusual landscape before you. As you open the door, you realize you cannot breathe. You quickly shut the door, realizing you are in the ________.

Question

Quizplus · Accepted Answer

The Archaean eon, which lasted from about 4 billion to 2.5 billion years ago, was characterized by a lack of oxygen in the atmosphere, so it is possible that the student cannot breathe upon exiting the time machine. The other options, Anthropocene epoch, Cenozoic era, and Mesozoic era, are all relatively recent in Earth's history and would not have the same lack of oxygen.

You Are the Lucky Student of a Wacky Professor Who