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Scientists and ResearchTracking Endangered Jaguars across the Border
This module offers an in-depth profile of wildlife biologist Sergio Avila and his work to...
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Earth ScienceFactors that Control Earth's Temperature
Based on how much sunlight hits Earth versus how much is reflected, Earth’s average temperature...
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Earth ScienceThe Nitrogen Cycle
This module provides an overview of the nitrogen cycle and the chemical changes that govern...
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