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GEM Subject is
Science -- Natural history
46 - 50
National Geographic: Prehistoric Time Line
Humans haven't roamed the earth for long, and our presence on this planet only dates back around 190,000 years. There are approximately 4.3 billion more years of Earth's history to explore, and this interactive and...
Patterns of Gene Expression in Drosophila Embryogenesis
A new image database of gene expression patterns in Drosophila embryogenesis is now available from the Berkeley Drosophila Genome Project (BDGP), a consortium of the Drosophila Genome Center. The BDGP team used "high...
Fragile Fringe: A Guide for Teaching about Coastal Wetlands
This "Guide for Teaching About Coastal Wetlands", from the U.S. Geological Survey's National Wetlands Research Center, helps students identify types of wetlands & understand the role of wetlands in controlling erosion,...
Overflowing the Banks
This teaching activity illustrates how levees on the Mississippi River exacerbated flood damage in St. Louis during the Great Flood of l993. Students build a model of a river system and observe the results of flooding...
Tale of a Whale (and Why It Can Be Told)
In this issue?s lesson, students exercise their observation skills to do some of the actual work of marine biologists who study the endangered North Atlantic right whale. They identify an individual whale by examining p...
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