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This field activity introduces students to the concept of a system. Students identify the components, inputs and outputs of the local system at a range of biometry study sites, as well as the boundaries of their investigations at these sites in terms of space and time. Collected data from the different sites are analyzed and compared. The activity includes a student worksheet and data charts. Equipment needed to do this activity includes a compass and camera. This is a learning activity associated with the GLOBE Land Cover/Biology investigations and is supported by the GLOBE Teacher's Guide, Land Cover/Biology.