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Explore how the Sun, Earth's interior heat and chemical reactions drive energy and matter through the geosphere, hydrosphere, atmosphere and biosphere.
Explore the human eye's structure—cornea, iris, lens, retina—and learn about defects, prism effects, atmospheric refraction and light scattering.
Learn what plasmolysis is, how it works in plant cells, and why it matters in biology with clear definitions and examples.
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