BrainStuff Classics: Why Don't Evergreen Trees Lose Their Needles?

Evergreens' needles are their leaves, so why don't they change color and drop in the fall? Learn how evergreen leaves work in this classic episode of BrainStuff, based on this article: https://home.howstuffworks.com/evergreen-trees-dont-shed.htmSee omnystudio.com/listener for privacy information.