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In this activity, learners will simulate the interactions between a predator population of gray wolves and a prey population of deer in a forest.

This activity (page 3 of the PDF under SciGirls Activity: Dinosaurs) is a full inquiry investigation into fossil hunting and identification.

Learners use a variety of beans to represent a variety of species, and scatter these beans over a large piece of paper representing the environment.

In this activity, learners construct possible food webs for six different ecosystems as they learn about the roles of different kinds of living organisms.

Make impact craters with marbles (or rocks or washers) in a container of flour. Find out what you can learn about your "comets" by the craters they make.

In this game, learners each represent a different organism in an environment. They build a web during the activity, and discover how all the players in an ecosystem depend on each other.

In this outdoor activity, learners work in pairs using their senses—especially touch—to learn more about individual trees.

In the wild, small crustaceans known as brine shrimp live in marine habitats such as saltwater lakes.

In this activity, learners explore the web of connections among living and non-living things.

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