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In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

In this classic memory game (on pages 37-45 of PDF), learners turn over tiles to reveal images on the back.

In this outdoor activity, learners search for the warmest and coolest, windiest and calmest, wettest and driest, and brightest and darkest spots in an area.

In this activity, learners investigate the food, water, and space needs of common livestock animals.

In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.