Primary tabs

  • View
  • Take quiz
  • Results
  • My results(active tab)
For 28 years, Ask A Biologist has shared free, trusted educational resources with millions of learners.
Help us keep providing great learning experiences to everyone, for free.

Before you go, we need your help! Can you donate today to keep our resources free for everyone?

If just 3% of our visitors donated $5 today, we would have the support we need to keep offering all our learning resources for free for the next year.

Thank you for taking the first step toward supporting us!

Before you continue, can you please confirm your age? We ask this to help keep our site safe and compliant for all young learners.

I'm 16 or older I'm under 16
  • Ask A Question
  • Teacher's Toolbox
  • Listen and Watch
Ask A Biologist Logo
Date started Date finished Score
Mon, 05/19/2025 - 00:41
Mon, 05/19/2025 - 00:41
Mon, 05/19/2025 - 12:21
Mon, 05/19/2025 - 22:25
Thu, 05/22/2025 - 01:35
Fri, 05/23/2025 - 15:56
Sun, 05/25/2025 - 08:17
Sun, 05/25/2025 - 08:18
Tue, 05/27/2025 - 13:58
Thu, 05/29/2025 - 19:06
  • Previous page ‹‹
  • Page 11
  • Next page ››
National Science Foundation

Ask A Biologist funded in part by the
National Science Foundation
and NSDL

School of Life Sciences Arizona State University
School of Life Sciences

Contact Us

Contribute

Content
Stories Activities Inaccessible Games Virtual Reality (VR) Ask An Anthropologist Ask An Earth and Space Scientist
Tools
Ask A Question Teacher Toolbox Feedback
Usage
Guidelines Licensing and Permissions Participation
Acknowledgements
National Science Foundation Credits
Maps and Locations Jobs Directory Contact ASU My ASU
Repeatedly ranked #1 in innovation (ASU ahead of MIT and Stanford), sustainability (ASU ahead of Stanford and UC Berkeley), and global impact (ASU ahead of MIT and Penn State)
Copyright and Trademark Accessibility Privacy Terms of Use Emergency