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Grade 9  
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In this problem set, learners will analyze a table of the length of day (hours) and the number of days per year on Earth in past eras. They will calculate future values, plot some of the data and identify the rate of increase. Answer key is... (View More)

Keywords: Inquiry; Table analysis
Audience: Middle school, High school
Materials Cost: Free

This is a website about microbiology. Learners may explore information about microorganisms, extremophiles and extreme habitats, as well as the ecology, diversity and evolution of micro-organisms.