# Biological Clocks

Produced in cooperation with the National Education Association, the National Science Teachers Association, the American Library Association, and the American Institute of Biological Sciences

Investigates how animals are able to perform certain activities at specific times. Presents experiments to discover whether biological clocks are responsive to internal or external forces

- Kind: Educational
- Year: 1967
- Runtime: 24 min
- By: National Broadcasting Company, Graphic Curriculum, inc., New York
- Genres: Education, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/biologicalclocks)
- Licence or status: none stated by the archive
- Who can watch: Kids profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/biologicalclocks?play=1)