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In this activity (on pages 22-24 of the PDF), learners match extreme enviroments with life forms they support.

1 cent - $1 per group Ages 4 - 14 45 to 60 minutes
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In this astrobiology activity (on page 11 of the PDF), learners consider what organisms need in order to live (water, nutrients, and energy).

Over $20 per group Ages 8 - 18 1 to 4 weeks