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Earth's Resources (mostly Mining)
- DK Science 
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Renewable resources
- National Geographic 
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What is renewable energy?
- United Nations 
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Renewable Energy
- Energy.gov 
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Animal Classification
- AZ animals 
What is classification - article by Australian Museum
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Taxonomy - encyclopedic definition
Lumen Biology - Taxonomy learning module (includes example of how to classify dog showing the increasing specification through Class, Order and Family
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5 Kingdoms of Living Things
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What is an ecosystem - article by Australian Museum
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Ecosystem - National Geographic article
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What are Ecosystems - Crash Course Geography - Youtube video
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