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CBSE 9th Physics | Motion: Concepts
Motion: Concepts Concept Review REST An object is said to be at rest if it does not change its position with respect to its surroundings with the passage of time. MOTION A body is said to be in motion if its position changes continuously with respect to the surroundings (or with respect to an observer)…
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CBSE 9th Biology | Organization in the Living World- Practice Questions
Organization in the Living World- Practice Questions Fill in the Blanks 1……………………. tissues are regions where cells have lost their ability to divide. 2. Elongated cells with thickenings at corners constitute 3. Tracheids and vessels are the main elements in the xylem. 4. Lining of alveoli and blood capillaries is formed by epithelium. 5…………………….. connect…