This PDF presentation introduces microbes and provides an activity to estimate the mass of microbes in the human body.
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The Science of Microbes
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This site has a list of animations and tutorials for most biology topics. Each item in the list is linked to a site. These links are appropriate for a range of levels.
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Lone Star College Biology Tutorials
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A detailed view at animal cell structure
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Molecular Expressions
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Cell Cycle, Mitosis and Meiosis
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StudyStack
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Cell Structure and Function, Osmosis and Diffusion
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StudyStack
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Animal and Plant Cell Structure and Function
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StudyStack
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This website is clean and ad-free with short textbook modules on the different aspects of photosynthesis. It may be boring looking, but it gets straight to the point and has a self quiz at the end.
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The Biology Place: Biocoach Activity
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This is a good website for middle school students or even to explain the basic concepts of photosynthesis to elementary school students.
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First Steps
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