Why Do Leaves Fall?
The Big Idea
Discover the brilliant survival strategy trees use to endure the winter. Learn about the 'biological amputation' process that allows trees to shed their leaves and conserve energy for the spring.
Key Vocabulary & Concepts

Hands-On Observation Checklist
Teacher & Parent Discussion Starters
- Why is understanding why do leaves fall? important in everyday real life?
- What variable or factor had the biggest impact when testing the simulation?
- How does this concept connect to another science topic you have learned about?
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Journey to the frozen edge of the world to discover the ingenious biological armor of penguins. From waterproof feathers to extreme huddling tactics, learn how these birds thrive in the most brutal, sub-zero blizzards on Earth.
How Does Photosynthesis Work?
Explore the incredible biological engine that turns sunlight into food. Discover how plants use chlorophyll to capture the sun's energy, transforming water and air into the sugar and oxygen that all life on Earth depends on.
