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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 simulation, learners model two elephant seal populations and how they change over time. Learners start with cards representing a variety of seals.

In this simulation of natural selection, learners use binder clips in three different sizes to represent the diversity of beak sizes in a bird population.

In this outdoor game, learners simulate a herd of deer trying to survive in an area called the "home range." Learners explore the concept of "carrying capacity"—what size population of an organism can

In this creative outdoor activity, learners invent populations of make-believe organisms and then investigate real populations living in the activity site.

Learners explore the relationship between energy consumption, population, and carbon emissions in the countries of the Americas.

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