Multiple choice

In Mystery Science we learned _____ % of all Earth's animals died at the end of the cretaceous period.

  1. 50

  2. 75

  3. 85

  4. 90

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Cretaceous-Paleogene extinction event is estimated to have resulted in the extinction of approximately 75 percent of all species on Earth at that time.