Muscle cells in the stomach wall contract and relax to churn food. This mixing process helps digestive juices break food down efficiently before it moves to the small intestine. Class 8 Science Grade 8 Chapter 2 The Invisible Living World: Beyond ...
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Reading glasses correct near vision by adjusting the light’s focus on the retina. As we age, our eye lens weakens and glasses help compensate for this to restore clear close-up vision. Class 8 Science Curiosity Grade 8 Chapter 2 The Invisible ...
Some organisms are macroscopic and large enough to be seen directly. Others, like bacteria and protozoa, are microscopic, too small for the naked eye, requiring magnification tools like microscopes for visibility. Class 8 Science Grade 8 Chapter 2 The Invisible Living ...
The cell membrane acts as a selective barrier. It allows essential nutrients in, removes waste and protects internal structures. It maintains balance and supports communication between the cell and its environment. Class 8 Science Grade 8 Chapter 2 The Invisible Living ...