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In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.

free Ages 8 - 18 10 to 30 minutes
Source Institutions
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In this activity, learners explore the work of paleontologists.

$10 - $20 per group Ages 4 - 6 10 to 30 minutes