.🧬 The Fundamental Unit of Life – Detailed Notes (Class 9) 🧠 Why Study Cells? Every living being, from a tiny bacterium to a huge whale, is made up of cells. These cells are the building blocks of life. Just like bricks form buildings, cells form
Read More1. Human Respiratory System and Its Organs The respiratory system facilitates gas exchange (O₂ in, CO₂ out). Key organs: A. Main Organs Organ Function Nose Air enters; hairs filter dust. Windpipe (Trachea) Tube carrying air to lungs. Bronchi Two branches leading to each lung. Lungs Spongy
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