Quiz - Trillions of Cicadas Are Coming!
After reading the article, take this short quiz to test your understanding.
Question 1 / 4
How do the cicadas underground know when to come up after 17 years?
How do the cicadas underground know when to come up after 17 years?
![](https://gdb.voanews.com/07d3162b-e7e4-4741-819f-7513dc8c2d6d_w250_r1_s.jpg)