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Have you noticed the plastic rings that are used to hold six-packs of soda? Those rings are great for carrying cans, but they're real trouble when they become trash that animals can get tangled in.

In this activity on page 11 of the PDF, learners follow simple steps to recycle old newspaper into new paper.

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.