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In this math lesson, learners apply the concepts of ratio and proportion to the capture-recapture statistical procedure.

In this data analysis and environmental science activity, learners examine the effects of pollution on amphipods using data from the Chesapeake Ecotox Research Program.

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.