By Virginia Kirsch
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In this animated object, students observe how ATP energy is used to move substances across the cell membrane from an area of lower concentration to an area of higher concentration and when something too large needs to get in or out of a cell.
Instructions on how to interpret state indicator symbols for input and output terminals of digital devices is presented.
In this learning activity you'll quiz yourself about Greenland by answering questions about the people, the land, and the economy.