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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 place cards featuring biological structures in order by their relative size from largest to smallest.

1 cent - $1 per group Ages 11 - 18 10 to 30 minutes