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Lesson 2

Are All Radish Rootlets and Snail Shells the Same? What's the Evidence? 

Big Idea:

Variation occurs naturally within plant and animal populations. Variation is the raw material for natural selection. 

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Students observe and describe one trait in a population of plants (radishes) and one in a population of animals (snails). They consider how all populations of living things have variation in their traits, in preparation for thinking about why that might matter when environmental changes occur.

Materials to Have Ready

​​For each student:

Notebook pages 4-7

For each small group:

A set of germinating radish seeds planted 5 days before

A set of snail shells

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