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- (-) Health and immunity
- (-) Geography
- (-) Motion under gravity
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Overview of types of immune responses. Difference between innate and adaptive immunity. Differences between humoral adaptive immunity and cell-mediated adaptive immunity.
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These three short online lessons discuss asteroids, comets and meteors.
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This online resource discusses the distribution of earth's water.
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These two short online tutorials discuss how the earth rotates and then the earth's revolutions.
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In the first URL, the YouTube video explains why earth has spring, summer, autumn and winter seasons. The second URL summarizes the key takeaway points.
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This online tutorial will explain the earth's shape and its hemispheres.
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Why do astronauts appear weightless despite being near the Earth?
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This YouTube video explains how to calculate an irregular area on a map.
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This YouTube video explains how to calculate a regular area on a map.