Chapter 1. Geobiology

Map Learning Exercises

Geobiology: Cambrian explosion

Question Click on the general time period in which the Cambrian explosion occurred.

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{"title":"After","description":"This time period is after the Cambrian explosion. There are already land animals at this time.","type":"incorrect","color":"#99cc00","code":"[{\"shape\":\"rect\",\"coords\":\"526,2,582,16\"}]"} {"title":"542 Ma","description":"","type":"correct","color":"#993300","code":"[{\"shape\":\"rect\",\"coords\":\"501,1,527,17\"}]"} {"title":"Primitive life","description":"This time period is too early. Only primitive life, such as bacteria, exists.","type":"incorrect","color":"#ff9900","code":"[{\"shape\":\"rect\",\"coords\":\"146,1,502,17\"}]"} {"title":"Before life","description":"This time period is too early. No life existed on Earth yet.","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"12,1,146,17\"}]"}
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